ORCID Profile
0000-0003-2983-5194
Current Organisation
University of South Australia
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Publisher: Oxford University Press (OUP)
Date: 16-06-2022
Abstract: We present an extensive catalogue of BY Draconis (BY Dra)-type variables and their stellar parameters. BY Dra are main-sequence FGKM-type stars. They exhibit inhomogeneous starspots and bright faculae in their photospheres. These features are caused by stellar magnetic fields, which are carried along with the stellar disc through rotation and which produce gradual modulations in their light curves (LCs). Our main objective is to characterize the properties of BY Dra variables over a wide range of stellar masses, temperatures, and rotation periods. A recent study categorized 84 697 BY Dra variables from Data Release 2 of the Zwicky Transient Facility based on their LCs. We have collected additional photometric data from multiple surveys and performed broad-band spectral energy distribution fits to estimate stellar parameters. We found that more than half of our s le objects are of K spectral type, covering an extensive range of stellar parameters in the low-mass regime (0.1–1.3 M⊙). Compared with previous studies, most of the sources in our catalogue are rapid rotators, and so most of them must be young stars for which a spin-down has not yet occurred. We sub ided our catalogue based on convection zone depth and found that the photospheric activity index, Sph, is lower for higher effective temperatures, i.e. for thinner convective envelopes. We observe a broad range of photospheric magnetic activity for different spectral classes owing to the presence of stellar populations of different ages. We found a higher magnetically active fraction for K- than M-type stars.
Publisher: Oxford University Press (OUP)
Date: 28-06-2022
Abstract: The distribution of young stars into OB associations has long been in need of updating. High-precision Gaia Early Data Release 3 astrometry, coupled with modern machine-learning methods, allows this to be done. We have compiled a well-defined s le which includes OB stars and young open clusters (OCs), in total comprising about 47 700 objects. To break the s le down into groupings resembling associations, we applied the HDBSCAN* clustering algorithm. We used a Monte Carlo method to estimate the kinematic ages of the resulting clusters and the Student’s t-test to assess the significance of the linear correlations between proper motions and coordinates, indicating the presence of possible cluster expansion signatures. The ages of the majority of clusters demonstrating a general expansion at a 1σ confidence level are several tens of Myr, which is in agreement with the expected ages of OB associations. We found 32 OCs which turned out to be members of the resulting groupings their ages are consistent with one another within the uncertainties. Comparison of the clusters thus obtained with the historical composition of OB associations in the literature shows a correspondence between their positions in the Galaxy but an apparent absence of good one-to-one stellar matches. Therefore, we suggest that the historical composition of OB associations needs to be revised.
Publisher: The Centre for Excellence in Child and Family Welfare
Date: 09-2014
DOI: 10.1017/CHA.2014.17
Abstract: There are currently widespread concerns around the impact of media on children's healthy development. This study investigated whether music media influences young children's gender role and self-identity. Thirty-four Grade 1 children and 38 Grade 4 children participated in an experimental study to explore their attitudes towards their own and the opposite gender, their perspectives about gender- and self-presentation, and whether a one-off exposure to music videos influenced their views. Results showed that children demonstrated attitudes consistent with gender stereotypes seen in contemporary music media. The findings indicate a need for early intervention to help children develop healthy attitudes around gender role and self-identity.
Publisher: Informa UK Limited
Date: 28-07-2017
Publisher: The Centre for Excellence in Child and Family Welfare
Date: 03-2015
DOI: 10.1017/CHA.2014.39
Abstract: Although many researchers have demonstrated that music videos contain high levels of sexual connotation, none have specifically investigated music videos accessible to young children. This study analysed 405 in idual music videos broadcast on Australian free-to-air television in time periods classified PG/G to identify the types and frequency of sexualised display. Results showed that these music videos contained relatively high levels of sexualised content, with particular genres and artists displaying higher levels of sexualised material. The findings indicate a need for a review of the current Australian classification system.
Publisher: EDP Sciences
Date: 04-2023
DOI: 10.1051/0004-6361/202244798
Abstract: In the past few years, we have undertaken an extensive investigation of star clusters and their stellar populations in the Large and Small Magellanic Clouds (LMC and SMC) based on archival images collected with the Hubble Space Telescope. We present photometry and astrometry of stars in 101 fields observed with the Wide Field Channel of the Advanced Camera for Surveys and the Ultraviolet and Visual Channel and the Near-Infrared Channel of Wide Field Camera 3. These fields comprise 113 star clusters. We provide differential-reddening maps for those clusters with significant reddening variations across the field of view. We illustrate various scientific outcomes that arise from the early inspection of the photometric catalogs. In particular, we provide new insights into the extended main-sequence turnoff (eMSTO) phenomenon: (i) We detected eMSTOs in two clusters, KMHK 361 and NGC 265, which had no previous evidence of multiple populations. This finding corroborates the conclusion that the eMSTO is a widespread phenomenon among clusters younger than ∼2 Gyr. (ii) The homogeneous color-magnitude diagrams (CMDs) of 19 LMC clusters reveal that the distribution of stars along the eMSTO depends on cluster age. (iii) We discovered a new feature along the eMSTO of NGC 1783, which consists of a distinct group of stars on the red side of the eMSTO in CMDs composed of UV filters. Furthermore, we derived the proper motions of stars in the fields of view of clusters with multi-epoch images. Proper motions allowed us to separate the bulk of bright field stars from cluster members and investigate the internal kinematics of stellar populations in various LMC and SMC fields. As an ex le, we analyze the field around NGC 346 to disentangle the motions of its stellar populations, including NGC 364 and BS 90, young and pre-main-sequence stars in the star-forming region associated with NGC 346, and young and old field stellar populations of the SMC. Based on these results and the fields around five additional clusters, we find that young SMC stars exhibit elongated proper-motion distributions that point toward the LMC, thus providing new evidence for a kinematic connection between the LMC and SMC.
Publisher: Australian Centre for Child Protection
Date: 2017
Publisher: Elsevier BV
Date: 12-2021
DOI: 10.1016/J.CHIABU.2021.105301
Abstract: This study explored the associations between child maltreatment and functional resilience at school commencement, and investigated factors related to resilience separately for boys and girls. Children were part of a birth cohort of all children born in South Australia between 1986 and 2017 who had completed the Early Australian Development Census (AEDC) at about age 5-6 years when starting primary school (N = 65,083). Multivariable logistic regression analysis was conducted with a subs le of 3414 high-risk children who had a maltreatment substantiation or investigation, with resilience defined as having well or highly developed strengths on the Multiple Strength Indicator of the AEDC. CPS involvement was strongly associated with poorer functioning at school commencement. Among high-risk children, 51.2% demonstrated resilience. Predictors of resilience in the multivariable model were being older, not having an emotional condition, and being read to at home. Risk factors were being male, living in rural or remote areas, having a physical or sensory disability, or having a learning disability. Boys who had been maltreated demonstrated few strengths and had less resilience than girls. Boys and girls who were read to regularly at home had more than three times the odds of showing resilience than children who were not read to at home. The early learning environment provides an ideal opportunity to identify and intervene to help those children who are struggling with school adjustment following familial maltreatment. Boys are likely to need additional help.
Publisher: EDP Sciences
Date: 07-2022
DOI: 10.1051/0004-6361/202142148
Abstract: Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies. Aims. The aim of this study is to investigate the kinematics of the outer regions of the LMC by using stellar proper motions to understand the impact of interactions, for ex le with the SMC about 250 Myr ago. Methods. We calculate proper motions using multi-epoch K s -band images from the VISTA survey of the Magellanic Cloud system (VMC). Observations span a time baseline of 2−5 yr. We combine the VMC data with data from the Gaia Early Data Release 3 and introduce a new method to distinguish between Magellanic and Milky Way stars based on a machine learning algorithm. This new technique enables a larger and cleaner s le selection of fainter sources as it reaches below the red clump of the LMC. Results. We investigate the impact of the SMC on the rotational field of the LMC and find hints of stripped SMC debris. The south-eastern region of the LMC shows a slow rotational speed compared to the overall rotation. N -body simulations suggest that this could be caused by a fraction of stripped SMC stars located in that particular region that move opposite to the expected rotation.
Publisher: Routledge
Date: 22-11-2018
Publisher: Oxford University Press (OUP)
Date: 10-06-2022
Abstract: We present a map of the total intrinsic reddening across ≃ 90 deg2 of the Large Magellanic Cloud (LMC) derived using optical (ugriz) and near-infrared (IR YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is created from a s le of 222 752 early-type galaxies based on the lephareχ2 minimization SED-fitting routine. We find excellent agreement between the regions of enhanced intrinsic reddening across the central (4 × 4 deg2) region of the LMC and the morphology of the low-level pervasive dust emission as traced by far-IR emission. In addition, we are able to distinguish smaller, isolated enhancements that are coincident with known star-forming regions and the clustering of young stars observed in morphology maps. The level of reddening associated with the molecular ridge south of 30 Doradus is, however, smaller than in the literature reddening maps. The reduced number of galaxies detected in this region, due to high extinction and crowding, may bias our results towards lower reddening values. Our map is consistent with maps derived from red clump stars and from the analysis of the star formation history across the LMC. This study represents one of the first large-scale categorizations of extragalactic sources behind the LMC and as such we provide the lephare outputs for our full s le of ∼ 2.5 million sources.
Publisher: SAGE Publications
Date: 10-2019
Abstract: Advances in technology have made music more readily accessible and geographic distance irrelevant in dissemination of music. Greater access to popular music has resulted in greater consumption by both children and adolescents. Popular music in the United States may contain the most sexual content, compared with other forms of media. Exposure to such content is associated with the development of gender ideals and identity, objectification and sexualization of women, permissive sexual attitudes and risky sexual behaviors, as well as greater acceptance of sexual and gendered violence. Even so, current education standards do not include media literacy, much less popular music media literacy, and do not prepare children for best practices related to media consumption. Some of the inadequacies in current education standards include introducing education about media influence on personal development at an age far later than children’s engagement with contemporary media, avoidance of controversial topics, and not making this education compulsory. Considering the lack of media literacy provided in the curriculum, we outline specific foundational curricular recommendations related to media education and specifically for popular music media literacy.
Publisher: Oxford University Press (OUP)
Date: 14-04-2022
Abstract: We present proper motion (PM) measurements within the central region of the Large Magellanic Cloud (LMC), using near-infrared data from the VISTA survey of the Magellanic Cloud system (VMC). This work encompasses 18 VMC tiles covering a total sky area of ∼28 deg2. We computed absolute stellar PMs from multiepoch observations in the Ks filter over time baselines between ∼12 and 47 months. Our final catalogue contains ∼6322 000 likely LMC member stars with derived PMs. We employed a simple flat-rotating disc model to analyse and interpret the PM data. We found a stellar centre of rotation ($\\alpha _{0} = 79.95^{\\circ }\\,^{+0.22}_{-0.23}$, $\\delta _0 = -69.31^{\\circ }\\,^{+0.12}_{-0.11}$) that is in agreement with that resulting from Hubble Space Telescope data. The inferred viewing angles of the LMC disc ($i=33.5^{\\circ }\\,^{+1.2}_{-1.3}$, $\\Theta =129.8^{\\circ }\\,^{+1.9}_{-1.9}$) are in good agreement with values from the literature but suggest a higher inclination of the central parts of the LMC. Our data confirm a higher rotation litude for the young (≲0.5 Gyr) stars compared to the intermediate-age/old (≳1 Gyr) population, which can be explained by asymmetric drift. We constructed spatially resolved velocity maps of the intermediate-age/old and young populations. Intermediate-age/old stars follow elongated orbits parallel to the bar’s major axis, providing first observational evidence for x1 orbits within the LMC bar. In the innermost regions, the motions show more chaotic structures. Young stars show motions along a central filamentary bar structure.
Publisher: Informa UK Limited
Date: 02-07-2020
Publisher: Informa UK Limited
Date: 30-03-2016
Publisher: China Science Publishing & Media Ltd.
Date: 03-2023
Publisher: SAGE Publications
Date: 03-2016
DOI: 10.1177/183693911604100106
Abstract: SEEKING CHILDREN'S PERSPECTIVES regarding matters that concern them is widely accepted and practised among researchers. Despite this, literature on research methods with young children is inconsistent. This paper reports on an analysis of semi-structured, single and group interviews conducted with six-year-old children over two visits to six erse schools in an Australian state capital city. The findings highlighted that six-year-old children understood their role in the research process and sustained active engagement for lengthy amounts of time. This article highlights the need for researchers to critically evaluate their perspectives of children's capacity to participate in research. If researchers position children as disproportionately vulnerable, their voice could be restricted. Providing children every opportunity to express their perspectives in interviews is paramount, therefore the author presents considerations for best practice.
Publisher: Routledge
Date: 05-05-2020
Publisher: Oxford University Press (OUP)
Date: 04-05-2023
Abstract: We present a kinematic analysis of the Small Magellanic Cloud using 3700 spectra extracted from the European Southern Observatory archive. We used data from Gaia and near-infrared photometry to select stellar populations and discard Galactic foreground stars. The s le includes main-sequence red giant branch and red clump stars, observed with Fibre Large Array Multi Wavelength Spectrograph. The spectra have a resolving power λ/Δλ from 6500 to 38 000. We derive radial velocities by employing a full spectrum fitting method using a penalized pixel fitting routine. We obtain a mean radial velocity for the galaxy of 159 ± 2 km s−1, with a velocity dispersion of 33 ± 2 km s−1. Our velocities agree with literature estimates for similar (young or old) stellar populations. The radial velocity of stars in the Wing and bar-like structures differ as a consequence of the dynamical interaction with the Large Magellanic Cloud. The higher radial velocity of young main-sequence stars in the bar compared to that of supergiants can be attributed to star formation around 40 Myr ago from gas already influenced by tidal stripping. Similarly, young main-sequence stars in the northern part of the bar, resulting from a prominent star forming episode 25 Myr ago, have a higher radial velocity than stars in the southern part. Radial velocity differences between the northern and southern bar overdensities are also traced by giant stars. They are corroborated by studies of the cold gas and proper motion indicating stretching/tidal stripping of the galaxy.
Publisher: Oxford University Press (OUP)
Date: 21-08-2023
Abstract: In our recent catalogue of BY Draconis (BY Dra) variables based on Zwicky Transient Facility data, we found traces of a period gap in the period–colour diagram. We combined our BY Dra database with catalogues from the Kepler and K2 surveys, revealing a prominent period gap. Here, we use this combined ZTF–Kepler–K2 data set to investigate the origin of the period gap observed for BY Dra stars using chromospheric activity indices. We use low- and medium-resolution spectra from the LAMOST Data Release 7 to derive magnetic activity indices for the Ca ii H and K and Hα emission lines. We find a strong dependence of chromospheric activity on both stellar mass and rotation period. For partially convective K–M-type stars, the activity decreases steeply up to an age of ∼700–1000 Myr, subsequently evolving to the type of low-level saturation associated with spin-down stallation. In contrast, F–G-type stars with thinner convective envelopes exhibit constant activity with increasing age. We suspect that the observed steep decrease for partially convective stars is driven by core–envelope coupling. This mechanism reduces differential rotation at the core–envelope transition, hence leading to decreased magnetic activity. Moreover, we derive activity indices for previously known star clusters and find similar trends as regards their activity levels as a function of age. In particular, very low-level activity is observed around the location of the period gap. Therefore, we conclude that the period gap, defined by the non-detection of variable sources, is driven by a minimum in chromospheric activity.
Publisher: SAGE Publications
Date: 17-03-2019
Abstract: Advances in technology have seen a proliferation of touch-screen interfaces available to young children. These screens have changed the way in which young children engage with digital technology with increased exposure and use, it raises debates about the suitability of integrating digital technology within early childhood settings. There are limited empirical studies that investigate the appropriateness of emergent digital technology within the field of early childhood. Based upon the TPACK model, this timely paper thus discussed the Digital Play Model (Numeracy) and reported on a project investigating the integration of digital technologies into childcare settings. In particular, the focus of this paper was to report on the use of games using a gestural interface device have on 3- to 4-year-old children’s ability to learn numeracy concepts. This study found that young children’s numeracy learning outcomes were improved. This paper also provided empirical evidence of the use of Apps via iPad technologies on young children’s numeracy learning, with an implication to a need for a pedagogical model for successful integration of digital technology within early childhood settings.
Publisher: Elsevier
Date: 2019
Publisher: Frontiers Media SA
Date: 21-11-2022
Publisher: The Centre for Excellence in Child and Family Welfare
Date: 16-08-2013
DOI: 10.1017/CHA.2013.15
Abstract: Music media contains high levels of sexual content and children spend a considerable amount of time interacting with it. This poses the question as to whether children internalise and imitate the sexual behaviours displayed by music artists. This study observed the self-presentation of 366 children aged 5–14 years at two Australian primary school discos. Children of all age groups were directly imitating both sexual and non-sexual dress and behaviours seen in contemporary music videos. Approximately one third of children observed presented in a sexualised way, which suggests children more broadly may be adopting sexualised behaviours at an early age. The prevalence and nature of sexualised behaviours by children, and the impact of this on children's socio-sexual development, are matters requiring further investigation.
Publisher: American Astronomical Society
Date: 27-09-2022
Abstract: Multimode Cepheids pulsate simultaneously in more than one mode of oscillation. They provide an independent means to test stellar models and pulsation theories. They can also be used to derive metallicities. In recent years, the number of known multimode Cepheids has increased dramatically with the discovery of a large number of Galactic double-mode Cepheids. To date, 209 double-mode Cepheids have been detected in the Galactic bulge and disk, mostly based on the Optical Gravitational Lensing Experiment’s (OGLE) catalog. In this paper, we conduct a comprehensive search for double-mode Cepheids in the northern sky based on Zwicky Transient Facility Data Release 5. We found 72 such objects in the Milky Way. The periods of the 30 s le objects already included in the OGLE catalog show excellent agreement with the OGLE periods. The period ratios of our new Cepheids are consistent with those of known double-mode Cepheids, as evidenced by their loci in the so-called “Petersen diagram.” Compared with OGLE, the completeness of our double-mode Cepheid s le is around 71%. The much improved temporal s ling of the Zwicky Transient Facility offers significant scope to find more double-mode Cepheids, especially at the distribution’s short-period end.
Publisher: SAGE Publications
Date: 02-2011
Abstract: The Internet provides remarkable opportunities for children’s learning and development. Nevertheless, it is unregulated and hard to control, which potentially places children at risk of exploitation. This study examined five—eight-year-old children’s understanding of dangers associated with the Internet, management strategies and sources of their understanding. Children in small groups answered questions relating to what they consider dangerous interactions or materials connected with the Internet, management strategies they would employ if confronted with these, and who taught them what they knew. Many children reported prior negative experiences on the Internet. Although they identified several risk categories, when presented with potentially dangerous Internet interactions almost half were not able to identify the associated risks. Most children identified appropriate management strategies however, it was evident that children could not safely employ these because they were unable to recognize potential dangers. Just under half of the children indicated they had not been taught Internet safety. Internet risks for children can be reduced through education in their recognition of potential dangers, recall and management strategies, indicating a need for schools to incorporate Internet safety into curricula.
Publisher: Elsevier BV
Date: 12-2022
Publisher: University of South Australia, prepared for the Organisation Mondiale pour l'Education Préscolaire (OMEP)
Date: 2018
Publisher: Springer Science and Business Media LLC
Date: 23-01-2017
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 09-2020
Publisher: The Centre for Excellence in Child and Family Welfare
Date: 22-09-2016
DOI: 10.1017/CHA.2016.29
Abstract: Professor Briggs began her career as a clerk at a chemical plant at age 14 years, and in 1950 she joined the London Metropolitan Police, New Scotland Yard where she worked in the child protection unit. It was here that she witnessed child abuse and the challenging social circumstances for many children, igniting her great interest in the protection of children. After marrying her long-time sweetheart Kenneth Briggs, having children and becoming a foster carer, she undertook her Year 12 studies by correspondence. She furthered her education by studying teaching at Warwick University. She then taught at Chesterfield Primary School.
Publisher: Eurasian Society of Educational Research
Date: 15-02-2019
DOI: 10.12973/IJEM.5.1.19
Abstract: style="text-align: justify " Child maltreatment is a serious problem, worldwide. Children and young people who have experienced maltreatment face multiple physical and mental health challenges which hinder their success at school and these adverse experiences makes them more challenging to teach than their non-maltreated peers. Increasingly, teachers are considered as an important part of the wider the child protection workforce as they are well-placed to intervene and prevent further harm. To fulfil this role effectively, teachers require requisite training beginning in initial teacher education programs. This paper is a protocol for a systematic scoping review that asks: “What is known about preservice/initial teacher education for child protection?” Systematic scoping reviews are worthwhile and necessary in fields where research is erse and needing of synthesis to identify strengths in the body of evidence and identify gaps to set new research directions. We will draw on Askey and O’Malley’s six-stage scoping review methodology to assess the scope, range, and nature of research activity on this topic. We will add an innovative seventh stage involving a commitment to disseminating and applying knowledge generated from the review. The research question has been established, and key terms defined (Stage 1). The search strategy has been devised, and searches have been run (Stage 2). Round 1 screening of titles and abstracts is completed and full text screening is currently in progress (Stage 3). To our knowledge this is the first attempt to systematically map the empirical literature on child protection in pre-service teacher education. When completed, this systematic scoping review will offer a comprehensive, transparent, and replicable way to assess the full scope of empirical research on this important topic of utmost educational relevance.
Publisher: The Centre for Excellence in Child and Family Welfare
Date: 17-12-2015
DOI: 10.1017/CHA.2015.61
Publisher: University of Rhode Island
Date: 12-2022
Publisher: American Astronomical Society
Date: 27-07-2023
Publisher: SAGE Publications
Date: 18-03-2019
Abstract: Research into young children’s understanding of bullying in the early years of schooling is limited. The current study examined young children’s understanding, explanations and reasoning behind whether behaviours represented in cartoon scenarios depicted bullying or non-bullying incidents. Seventy-seven children aged 4–8 years from one kindergarten and three schools in metropolitan South Australia participated in single, age-appropriate interviews with an early childhood educator/researcher. All children described each cartoon ( N = 77) explaining their reasons why they considered each one as bullying or not ( N = 76). Consistent with previous research which employed cartoon methodology with young children, findings indicated that children confused bullying with aggressive-only behaviour, resulting in over-labelling incidents as bullying. Examination of their thinking about bullying revealed that children in this study drew on moral reasoning perspectives and their understanding of relevant behavioural and social expectations and conventions.
Publisher: MDPI AG
Date: 26-05-2015
DOI: 10.3390/SOC5020492
Publisher: Cambridge University Press (CUP)
Date: 15-09-2021
DOI: 10.1017/JGC.2021.20
Abstract: Bullying and cyberbullying are global phenomena negatively impacting on children’s and young people’s (CYP’s) mental health and wellbeing and affecting their school social experiences and learning outcomes. Many interventions and prevention approaches have been employed over the decades, most impacting differentially, with some success in certain contexts and situations but not universally, suggesting the need for more contextualised, nuanced approaches at the whole school, community, in idual and peer-group levels. The recognition of the importance of student and teacher voice in recent years has heralded interest in co-design practices to deliver more context-relevant interventions and prevention strategies. This article considers how participatory design and co-design practices can form part of the prevention and intervention repertoire for schools, teachers, counsellors and psychologists in their quest to understand and reduce cyberbullying and/or bullying (C/B) behaviours. Two case-study exemplars are provided that reflect the importance of context and student-centred relevancy to inform practice.
Publisher: American Astronomical Society
Date: 02-2023
Abstract: RR Lyrae variables are excellent Population II distance indicators thanks to their well-defined period–luminosity relations (PLRs) at infrared wavelengths. We present results of near-infrared (NIR) monitoring of Galactic globular clusters to empirically quantify the metallicity dependence of NIR PLRs for RR Lyrae variables. Our s le includes homogeneous, accurate, and precise photometric data for 964 RR Lyrae variables in 11 globular clusters covering a large metallicity range (Δ[Fe/H] ∼ 2 dex). We derive JHK s -band period–luminosity–metallicity (PLZ) and period–Wesenheit–metallicity (PWZ) relations anchored using 346 Milky Way field RR Lyrae stars with Gaia parallaxes, and simultaneously solved for independent distances to globular clusters. We find a significant metallicity dependence of ∼0.2 mag dex −1 in the JHK s -band PLZ and PWZ relations for RR Lyrae stars independent of the adopted metallicity scale. The metallicity coefficients and the zero-points of the empirical PLZ and PWZ relations are in excellent agreement with the predictions from the horizontal branch evolution and pulsation models. Furthermore, RR Lyrae–based distances to our s le of globular clusters are also statistically consistent with other independent measurements in the literature. Our recommended empirical JHK s -band PLZ relations for RR Lyrae stars with periods of fundamental mode pulsation ( P f ) are: M J = − 0.44 ( ± 0.03 ) − 1.83 ( ± 0.02 ) log ( P f ) + 0.20 ( ± 0.02 ) [ Fe / H ] ( σ = 0.05 mag ) M H = − 0.74 ( ± 0.02 ) − 2.29 ( ± 0.02 ) log ( P f ) + 0.19 ( ± 0.01 ) [ Fe / H ] ( σ = 0.05 mag ) M K s = − 0.80 ( ± 0.02 ) − 2.37 ( ± 0.02 ) log ( P f ) + 0.18 ( ± 0.01 ) [ Fe / H ] ( σ = 0.05 mag ) .
Publisher: Cambridge University Press
Date: 2018
Publisher: SAGE Publications
Date: 13-04-2021
DOI: 10.1177/08862605211006355
Abstract: School bullying is a global phenomenon with teachers often at the forefront of responding to this behavior. It is, therefore, important that teachers are able both to understand and articulate what bullying is and to recognize bullying behavior. Ninety-five Australian early childhood teachers participated in an online survey to define bullying, fighting and identify the differences between the two behaviors. They were also asked to identify from 20 scenarios whether the behaviors depicted traditional bullying behaviors, cyberbullying behaviors, non-bullying face-to-face behaviors or non-cyberbullying behaviors. Results found that teachers described some of the three characteristics of bullying, that is, the intention to harm, power difference, and repetition however, many teachers had difficulty clearly explaining the distinguishing differences between bullying and fighting. The majority of teachers identified the bullying behaviors in the scenarios however, some teachers misinterpreted some non-bullying behaviors as bullying. The need to increase teacher’s knowledge of bullying to support the prevention and intervention of bullying are discussed.
Publisher: American Astronomical Society
Date: 10-2022
Abstract: In addition to the extended main-sequence turnoffs widely found in young and intermediate-age (∼600 Myr to 2 Gyr old) star clusters, some younger clusters even exhibit split main sequences (MSs). Different stellar rotation rates are proposed to account for the bifurcated MS pattern, with red and blue MSs (rMS and bMS) populated by fast and slowly rotating stars, respectively. Using photometry from Gaia Early Data Release 3, we report a Galactic open cluster with a bifurcated MS, NGC 2422 (∼90 Myr). We exclude the possibilities that the bifurcated MS pattern is caused by photometric noise or differential reddening. We aim to examine if stellar rotation can account for the split MS. We use spectra observed with the Canada–France–Hawaii Telescope and the Southern African Large Telescope and directly measured v sin i , the projected rotational velocities, for stars populating the bMS and rMS. We find that their v sin i values are weakly correlated with their loci in the color–magnitude diagram because of contamination caused by a large fraction of rMS stars with low projected rotational velocities. Based on the spectral energy distribution fitting method, we suggest that these slowly rotating stars at the rMS may hide a binary companion, which breaks the expected v sin i –color correlation. Future time-domain studies focusing on whether these slowly rotating stars are radial velocity variables are crucial to test the roles of stellar rotation and binarity in generating the split MSs.
Publisher: Informa UK Limited
Date: 03-08-2017
DOI: 10.1080/10538712.2017.1349855
Abstract: It is widely recognized that children are sexual beings and their sexual development begins at an early age. Recently, there has been some concern about children's sexual behavior in educational settings (Knowles 2014). Obtaining a better understanding of what behaviors children are displaying in these settings provides valuable information to inform teacher education in this area as well as support systems for children. One hundred and seven Australian educators from care organizations, preschools, and government, independent, and Catholic primary schools participated in an extensive online questionnaire in relation to their understanding of and experiences with children's problematic sexual behaviors and their management strategies. Results found that 40.8% of educators had observed children displaying problematic sexual behavior in their educational setting. Educators' descriptions of their observations variously involved children physically acting out sexually with other children, sexually harassing other children, verbally attempting to coerce other children to participate in sexual behavior, and in idual displays of sexual behavior. A minority described behaviors that are considered developmentally typical but are not socially acceptable in an educational setting. These results indicate that there is a need for educator training, child education, and support services to enable an early intervention and prevention strategy to support the well-being of children.
Publisher: Informa UK Limited
Date: 02-06-2020
Publisher: Cambridge University Press
Date: 2018
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2020
End Date: 2022
Funder: Channel 7 Children's Research Foundation
View Funded ActivityStart Date: 2015
End Date: 2016
Funder: University of South Australia
View Funded Activity