An abundance analysis of a chemically peculiar B star - JL 87

Details An abundance analysis of a chemically peculiar B star - JL 87 An abundance analysis of a chemically peculiar B star - JL 87

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...465..541a&link_type=abstract

Astronomy and Astrophysics, Volume 465, Issue 2, April II 2007, pp.541-547

Astronomy and Astrophysics

Astrophysics

10

Stars: Chemically Peculiar, Stars: Early-Type, Subdwarfs, Stars: Individual: Jl 87, Stars: Abundances, Stars: Fundamental Parameters

Scientific paper

Aims: The aim of this study is to understand the nature and origin of a chemically peculiar star JL 87 by measuring its physical parameters and chemical abundances. Methods: Physical parameters - effective temperature, surface gravity and helium abundance were measured from a moderate resolution optical spectrum using fully line-blanketed LTE model atmospheres. The effective temperature and extinction were verified by comparing FUSE, IUE spectrophotometry and optical/IR broadband photometry with theoretical flux distributions from LTE model atmospheres. The photospheric chemical abundances were measured from a high-resolution optical spectrum using LTE model atmospheres and spectral synthesis. Results: On the basis of its physical parameters and chemical abundances, we confirm that JL 87 is a chemically peculiar subluminous B star. It is significantly cooler, has a lower surface gravity and is more helium-rich than previously believed. It is moderately enriched in carbon and nitrogen, but its overall metallicity is slightly subsolar. Conclusions: . The shallow-mixing model of a late core-flash on a white-dwarf cooling track currently provides the most consistent agreement with the observable properties of JL 87.
Based on observations obtained with the AAT, IUE and FUSE. Figure 6 and Table 4 are only available in electronic form at http://www.aanda.org

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