Very Low Mass Stars and Brown Dwarf Candidates in Orion OB1a and OB1b
2003 ◽
Vol 211
◽
pp. 119-122
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.
1993 ◽
Vol 137
◽
pp. 171-173
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