ULTRA-COOL M-DWARFS DISCOVERED BY QSO SURVEYS .1. THE APM OBJECTS

Citation
Jd. Kirkpatrick et al., ULTRA-COOL M-DWARFS DISCOVERED BY QSO SURVEYS .1. THE APM OBJECTS, The Astronomical journal, 113(4), 1997, pp. 1421-1428
Citations number
34
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046256
Volume
113
Issue
4
Year of publication
1997
Pages
1421 - 1428
Database
ISI
SICI code
0004-6256(1997)113:4<1421:UMDBQS>2.0.ZU;2-T
Abstract
Optical searches for highly redshifted QSOs often use a very red B-R c olor as their main selection criterion. During spectroscopic follow-up , some of the chosen objects are identified not as QSOs but as extreme ly red stars, a fraction of which will prove to be previously unrecogn ized dwarfs lying in the solar vicinity. In this first paper of the se ries, we present standard spectral types and infrared photometry of la te-type stars identified during the QSO search by Irwin, McMahon, & Ha zard. Of the seventeen stars discovered, nine are late-M giants and ei ght are late-M dwarfs. Among these are six ultra-cool dwarfs of type M 7 or later, some of which are rediscoveries of previously catalogued ( and subsequently forgotten) proper motion stars. (C) 1997 American Ast ronomical Society.