An abundance analysis of a chemically peculiar B star - JL 87
Abstract
Aims: The aim of this study is to understand the nature and origin of a chemically peculiar star
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
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
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 2007
- DOI:
- 10.1051/0004-6361:20066360
- Bibcode:
- 2007A&A...465..541A
- Keywords:
-
- stars: chemically peculiar;
- stars: early-type;
- subdwarfs;
- stars: individual: <ASTROBJ>JL 87</ASTROBJ>;
- stars: abundances;
- stars: fundamental parameters