The discovery of a field methane dwarf from Sloan Digital Sky Survey commissioning data

被引：185

作者：

Strauss, MA

Fan, XH

Gunn, JE

Leggett, SK

Geballe, TR

Pier, JR

Lupton, RH

Knapp, GR

Annis, J

Brinkmann, J

Crocker, JH

Csabai, I

Fukugita, M

Golimowski, DA

Harris, FH

Hennessy, GS

Hindsley, RB

Ivezic, Z

Kent, S

Lamb, DQ

Munn, JA

Newberg, HJ

Rechenmacher, R

Schneider, DP

Smith, JA

Stoughton, C

Tucker, DL

Waddell, P

York, DG

机构：

[1] Princeton Univ Observ, Princeton, NJ 08544 USA

[2] Joint Astron Ctr, United Kingdom Infrares Telescope, Hilo, HI 96720 USA

[3] Gemini N Observ, Hilo, HI 96720 USA

[4] USN Observ, Flagstaff Stn, Flagstaff, AZ 86002 USA

[5] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[6] Apache Point Observ, Sunspot, NM 88349 USA

[7] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[8] Eotvos Lorand Univ, Dept Phys Complex Syst, H-1117 Budapest, Hungary

[9] Univ Tokyo, Inst Cosm Ray Res, Tanashi, Tokyo 1888502, Japan

[10] USN Observ, Washington, DC 20392 USA

[11] Univ Chicago, Ctr Astron & Astrophys, Chicago, IL 60637 USA

[12] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[13] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[14] Univ Washington, Dept Astron, Seattle, WA 98195 USA

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 522卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

stars; low-mass; brown dwarfs; surveys;

D O I：

10.1086/312218

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of the coolest field dwarf yet known, selected as an unresolved object with extremely red colors from commissioning imaging data of the Sloan Digital Sky Survey. Its spectrum from 0.8 to 2.5 mu m is dominated by strong bands of H(2)O and CH(4). Its spectrum and colors over this range are very similar to those of Gl 229B, the only other known example of a methane dwarf. It is roughly 1.2 mag fainter than Gl 229B, suggesting that it lies at a distance of similar to 10 pc. Such a cool object must have a mass well below the hydrogen-burning limit of 0.08 M. and therefore is a genuine brown dwarf, with a probable mass in the range 0.015-0.06 M. for an age range of 0.3-5 Gyr.

引用

页码：L61 / L64

页数：4

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