New High Proper Motion M, L and T Dwarfs Discovered In the Infrared

Details New High Proper Motion M, L and T Dwarfs Discovered In the Infrared New High Proper Motion M, L and T Dwarfs Discovered In the Infrared

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331402s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #314.02; Bulletin of the American Astronomical Society, Vol. 41, p.291

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Scientific paper

We compared the 2MASS and SDSS point source catalogs in order to find very red high proper motion objects. Through this survey we found 36 previously unknown high proper motion objects with J<17 mags. Their red-optical colors indicate that 27 are M dwarfs, 8 are early-type L dwarfs, and 1 is a late-type T dwarf. The L dwarfs have J-Ks colors near the extrema of known L dwarfs indicating that previous surveys for L dwarfs using color as a selection criterion may be biased. Followup near-infrared spectroscopy on some of the objects shows that some of the L dwarfs exhibit peculiar spectral features similar to other peculiar ``blue'' L dwarfs and one could even be a subdwarf. We also detected hundreds of previously known high proper motion objects as well as 15 known L and T dwarfs, some of which had no known previous proper motion measurements.

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