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


Query : 2007A&A...465..541A

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 - 2023
#notes
1 CPD-62 2124 * 11 35 36.8614624296 -63 15 48.516783840 10.30 11.15 11.01 11.14   B2IIIHe 48 0
2 PG 1544+488 HS* 15 46 11.6930203944 +48 38 37.228874928   12.52 12.79 13.08   sdBC1VIIpHe39 41 1
3 CD-46 11775 pA* 17 42 33.9915492936 -46 58 48.829063584   11.14 11.27     OB+ 36 0
4 JL 87 HS* 21 48 37.7351993616 -76 20 44.612786472 11.04 11.96 12.07     sdBHe 33 0

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2023.02.01-06:38:37

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