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Very Low Mass Stars and Brown Dwarf Candidates in Orion OB1a and OB1b

Published online by Cambridge University Press:  26 May 2016

Frederick M. Walter ,
William H. Sherry  and
Scott J. Wolk
Frederick M. Walter
Affiliation:
Stony Brook University, Stony Brook NY 11794
William H. Sherry
Affiliation:
Stony Brook University, Stony Brook NY 11794
Scott J. Wolk
Affiliation:
Center for Astrophysics, 60 Garden St, Cambridge MA 02138

Abstract

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VRI images within the belt of Orion and the Ori OB1a association reveal a pre-main sequence locus extending to below our completeness limit of about V=21. We report here on followup JHK imaging and optical and near–IR spectroscopy of the faintest and reddest of the PMS candidates. We find that they are unreddened mid-to-late M “stars” which fall on a few million year isochrone. Masses are largely substellar, reaching as low as about 0.02 M⊙ (20 Jovian masses). The space density of the substellar objects is high.

Type
Part 2. Observations of Recently Born Substellar Objects
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 119 - 122
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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