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.

引用

页码：L123 / L126

页数：4