LP 400-22, a very low mass and high-velocity white dwarf

被引：26
作者：
Kawka, A
Vennes, S
Oswalt, TD
Smith, JA
Silvestri, NM
机构：
[1] AV CR, Astron Ustav, Ondrejov 25165, Czech Republic
[2] Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA
[3] Univ Washington, Dept Astron, Seattle, WA 98195 USA
来源：
ASTROPHYSICAL JOURNAL | 2006年 / 643卷 / 02期
关键词：
stars : atmospheres; stars : individual (LP 400-22); white dwarfs;
D O I：
10.1086/505143
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the identification of LP 400-22 (WD 2234 + 222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 +/- 140 K and a surface gravity of. Therefore, log g = 6.32 +/- 0.08 this is a helium-core white dwarf with a mass of 0.17 M-.. The tangential velocity of this white dwarf is 414 +/- 43 km s(-1), making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.
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页码：L123 / L126
页数：4
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