2007A&A...465..541A


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST14:53:48

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:

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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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 CPD-62 2124 * 11 35 36.8610077156 -63 15 48.510583184 10.30 11.07 10.99 11.14   B0 41 0
2 PG 1544+488 HS* 15 46 11.6932759584 +48 38 37.226255710   12.52 12.79 13.08   sdBC1VIIpHe39 35 0
3 CD-46 11775 pA* 17 42 33.9913554690 -46 58 48.827116256   11.14 11.27     OB+ 33 0
4 JL 87 HS* 21 48 37.7347483725 -76 20 44.615921478 11.04 11.96 12.07     sdBHe 29 0

    Equat.    Gal    SGal    Ecl

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2019.10.20-14:53:48

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