A white dwarf companion to the B5 V star HR 2875 (y Puppis)

被引：18
作者：
Vennes, S [1 ]
Berghofer, TW
Christian, DJ
机构：
[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[2] Australian Natl Univ, Astrophys Theory Ctr, Canberra, ACT 0200, Australia
[3] Univ Calif Berkeley, Ctr EUV Astrophys, Berkeley, CA 94720 USA
来源：
ASTROPHYSICAL JOURNAL | 1997年 / 491卷 / 02期
基金：
美国国家航空航天局;
关键词：
binaries; general; stars; abundances; individual; (HR; 2875); ultraviolet; white dwarfs;
D O I：
10.1086/311064
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An extreme-ultraviolet source in the EUVE and ROSAT Wide Field Camera catalogs, also identified with a very soft ROSAT PSPC X-ray source, is coincident with the B5 V star HR 2875 (y Pup). We present an analysis of PSPC and EUVE spectra revealing the presence of a hot white dwarf companion to HR 2875, which then constitute the first confirmed B star plus white dwarf system. The B star shows variable Si II, He I, and H I line profiles in high-dispersion spectra, possibly related to its binary nature, but our measurements limit the radial velocity semiamplitude of the B star to less than or equal to 2 km s(-1). We speculate that the white dwarf is most likely massive, and we propose some observational tests of the model.
引用
收藏
页码：L85 / L88
页数：4
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