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

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

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003iaus..211..119w&link_type=abstract

Brown Dwarfs, Proceedings of IAU Symposium #211, held 20-24 May 2002 at University of Hawaii, Honolulu, Hawaii. Edited by Eduard

Astronomy and Astrophysics

Astronomy

Scientific paper

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&sun; (20 Jovian masses). The space density of the substellar objects is high. % we will speculate on why the density is %so large in this fossil star forming region.

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