2007A&A...465..541A -
Astronomy and Astrophysics, volume 465, 541-547 (2007/4-2)
An abundance analysis of a chemically peculiar B star - JL87.
AHMAD A., BEHARA N.T., JEFFERY C.S., SAHIN T. and WOOLF V.M.
Abstract (from CDS):
The aim of this study is to understand the nature and origin of a chemically peculiar star
JL87 by measuring its physical parameters and chemical abundances. 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. On the basis of its physical parameters and chemical abundances, we confirm that
JL87 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. 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
JL87.
Abstract Copyright:
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Journal keyword(s):
stars: chemically peculiar - stars: early-type - subdwarfs - stars: individual: JL87 - stars: abundances - stars: fundamental parameters
Simbad objects:
4
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