Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..705s&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Scientific paper
We are conducting a large scale, multiwavelength survey of 5 sq. degrees of the Orion OB1b sub-association (Walter et al. 2000), a 2Myr old fossil OB association 440pc from the Sun. Young fossil OB associations are especially good sites to study the very low-mass end of the initial mass function (IMF) because low-mass stars and brown dwarfs are brightest during their pre-main-sequence (PMS) phase and brown dwarfs are still relatively hot. We identify candidate PMS stars by their position in the PMS locus of the color magnitude diagram traced by X-ray selected PMS stars. Our results for the first 2 sq. degrees of the association identify about 800 candidate PMS stars per sq. degree. Roughly 40% are in fact members of the association. We estimate masses by comparing PMS models with our BVRI photometry and with 2MASS JHK photometry. We have found 23 objects that are well fit by brown dwarf models.
Sherry William Henry
Walter Fred M.
Wolk Scott J.
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