A possible brown dwarf companion to the white dwarf GD 1400

被引：83

作者：

Farihi, J ^{[1
]}

Christopher, M

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] CALTECH, Dept Astron, Pasadena, CA 91125 USA

来源：

ASTRONOMICAL JOURNAL | 2004年 / 128卷 / 04期

关键词：

binaries : general; stars : individual (GD 1400); stars; low-mass; brown dwarfs; white dwarfs;

D O I：

10.1086/423919

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An unresolved, likely L dwarf companion to the DA white dwarf GD 1400 is reported. This would be only the second such system known, discovered 17 years after the prototype L dwarf, GD 165B, was determined to be a companion to a white dwarf. Photometric observations and model-predicted of the well-studied white dwarf primary stellar parameters indicate that GD 1400B has J - K greater than or similar to2.0 and M-K = 12.13 mag. If correct, this would place GD 1400B at spectral type L6, and it would be the lowest-luminosity unevolved companion known to a white dwarf and thus a definite brown dwarf. However, a low-resolution Keck NIRSPEC 2.1 - 2.4 mum spectrum may not be consistent with known L dwarfs. Uncertainties in classification will remain until the binary is resolved or a trigonometric parallax is measured.

引用

页码：1868 / 1871

页数：4

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