Evolving R Coronae Borealis Stars with MESA

The R Coronae Borealis (RCB) stars are rare hydrogen--deficient, carbon--rich supergiants. They undergo extreme, irregular declines in brightness of many magnitudes due to the formation of thick clouds of carbon dust. It is thought that RCB stars result from the mergers of CO/He white dwarf (WD) binaries. We constructed post--merger spherically asymmetric models computed with the MESA code, and then followed the evolution into the region of the HR diagram where the RCB stars are located. We also investigated nucleosynthesis in the dynamically accreting material of CO/He WD mergers which may provide a suitable environment for significant production of 18O and the very low 16O/18O values observed. We have also discovered that the N abundance depends sensitively on the peak temperature in the He--burning shell. Our MESA modeling consists of engineering the star by adding He--WD material to an initial CO--WD model, and then following the post--merger evolution using a nuclear--reaction network to match the observed RCB abundances as it expands and cools to become an RCB star. These new models are more physical because they include rotation, mixing, mass-loss, and nucleosynthesis within MESA. We follow the later evolution beyond the RCB phase to determine the stars' likely lifetimes. The relative numbers of known RCB and Extreme Helium (EHe) stars correspond well to the lifetimes predicted from the MESA models. In addition, most of computed abundances agree very well with the observed range of abundances for the RCB class.Comment: 14 pages, 7 figures, MNRAS in pres

Feasibility, Acceptability, and Preliminary Outcomes of a Culturally Adapted Evidence-Based Treatment for Latino Youth With ADHD

Objective: To advance our knowledge about the most effective way to treat Latino youth with ADHD, the current feasibility and pilot study compared a culturally adapted evidence-based treatment (CAT) for ADHD to standard evidence-based treatment (EBT). Method: Following a comprehensive ADHD assessment, 61 Latino families of school-aged children (mean age of 8 years) were randomly assigned to either CAT or standard EBT (i.e., parent management training). Results: CAT outperformed standard EBT when examining homework completion and mother-reported treatment satisfaction. Apart from two trends favoring CAT, CAT and EBT both resulted in significant improvements in parent- and teacher-reported ADHD symptoms and functional impairment, as well as mother- and father-reported parental functioning. Conclusion: CAT outperformed standard EBT when examining several engagement and acceptability outcomes. CAT and EBT were equally effective when examining traditional treatment outcomes, which is impressive considering the robustness of standard EBT, especially when delivered by culturally competent staff

Bildungspolitik in Frankreich

Ziel dieses Artikels ist es, die wesentlichen bildungspolitischen Erfahrungen der letzten Jahrzehnte in Frankreich darzustellen und im Hinblick auf die bildungspolitische Debatte in Deutschland zu bewerten. Die allgemeinen Ziele der Bildungspolitik - wie z.B. die Anhebung des Bildungsniveaus, die Verwirklichung sozialer Chancengleichheit, die Anpassung an den wirtschaftlichen und gesellschaftlichen Wandel - sowie ein großer Teil der Herausforderungen an das französische Bildungssystem - wie z.B. die Bildungsexpansion, die Heterogenität der Schüler- und Studentenbevölkerung, die hohe Arbeitslosigkeit sowie steigende Kosten - gelten zum Teil auch für Deutschland. Somit zeigen die in Frankreich ergriffenen Maßnahmen alternative Wege, auf ähnliche Herausforderungen zu reagieren

The Role of Acculturation Differences and Acculturation Conflict in Latino Family Mental Health

In order to help address the mental health disparities that exist for Latino families in the U.S., the current study sought to examine the acculturation–mental health link within the context of Latino families and to identify potential mechanisms for intervention to alleviate mental health problems in this population. Specifically, our goal was to examine how parent–adolescent acculturation differences were related to mental health in Latino adolescents and their parents and to understand the role of acculturation conflict and family functioning within Latino families. Participants included 84 adolescent–parent dyads recruited through bilingual middle schools. We found partial support for our hypothesis that family functioning mediates the relationship between acculturation differences and mental health outcomes for Latino parents. Additionally, we found partial support for our moderated mediation hypothesis; specifically, a significant conditional indirect effect was found for Latino cognitive acculturation differences on adolescent externalizing problems via family functioning at high levels of acculturation conflict. Exploratory analyses also indicated that acculturation conflict moderates the relationship between family functioning and externalizing problems for Latino adolescents. Results highlight the importance of understanding acculturation within the context of Latino families, as findings differed for adolescents and their parents. Additionally, findings suggest that differences in acculturation may not always be problematic and their impact likely depends on how families interpret such differences

Incremental Clinical Utility of ADHD Assessment Measures With Latino Families

Objective: This study examined the incremental clinical utility of parent and teacher reports of ADHD symptomatology and functional impairment in Latino youth, as well as parent and teacher agreement with the final clinical judgment on a diagnostic structured interview. Method: Participants included 70 Latino youth (47 males, 23 females; M age = 8.13 years, SD = 2.51 years) and their parents and teachers; 60 participants were diagnosed with ADHD. Correlations, percent agreement, kappas, and regressions were utilized. Results: Results demonstrated that teachers agreed with the final clinical judgment more often than did parents. Results additionally demonstrated that functional impairment did not statistically significantly improve diagnostic models already including ADHD symptoms; follow-up analyses were run and are discussed. Finally, results demonstrated that teacher reports statistically significantly improved diagnostic models already including parent reports. Conclusion: The current findings suggest the importance of including both parent and teacher reports of both ADHD symptomatology and functional impairment when assessing ADHD in Latino youth

Evolution of the Dark Matter Distribution at the Galactic Center

Annihilation radiation from neutralino dark matter at the Galactic center (GC) would be greatly enhanced if the dark matter were strongly clustered around the supermassive black hole (SBH). The existence of a dark-matter "spike" is made plausible by the observed, steeply-rising stellar density near the GC SBH. Here the time-dependent equations describing gravitational interaction of the dark matter particles with the stars are solved. Scattering of dark matter particles by stars would substantially lower the dark matter density near the GC SBH over 10^10 yr, due both to kinetic heating, and to capture of dark matter particles by the SBH. This result suggests that enhancements in the dark matter density around a SBH would be modest whether or not the host galaxy had experienced the scouring effects of a binary SBH.Comment: 5 pages, 3 figures. Submitted to Physical Review Letter

Quantitative evaluation of multiband photographic techniques Final report

Quantitative evaluation of multiband photographic techniques using combination of black and white and color photo

The Black Hole Mass-Bulge Luminosity Relationship for Active Galactic Nuclei from Reverberation Mapping and Hubble Space Telescope Imaging

We investigate the relationship between black hole mass and bulge luminosity for AGNs with reverberation-based black hole mass measurements and bulge luminosities from two-dimensional decompositions of Hubble Space Telescope host galaxy images. We find that the slope of the relationship for AGNs is 0.76-0.85 with an uncertainty of ~0.1, somewhat shallower than the M_BH \propto L^{1.0+/-0.1} relationship that has been fit to nearby quiescent galaxies with dynamical black hole mass measurements. This is somewhat perplexing, as the AGN black hole masses include an overall scaling factor that brings the AGN M_BH-sigma relationship into agreement with that of quiescent galaxies. We discuss biases that may be inherent to the AGN and quiescent galaxy samples and could cause the apparent inconsistency in the forms of their M_BH-L_bulge relationships.Comment: 5 pages, 3 figures and 2 tables, submitted to ApJ Letter