Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460609s&link_type=abstract
American Astronomical Society, AAS Meeting #214, #606.09
Astronomy and Astrophysics
Astronomy
Scientific paper
Several nearby associations have been identified as having members with the similar absolute motions with a small velocity dispersion. The surveys performed to date have concentrated on relatively bright members with spectral types earlier than M5, though a number of candidate members have been identified serendipitously (Cruz et al. 2009, 2009 AJ,137,3345.) Large samples of brown dwarfs are known at the very young ages ( < 5 Myr) in star-forming regions and at large age (100 Myr - 8Gyr) in the field. We need samples of brown dwarfs with ages of 10 - 50 Myr to study planet-formation and evolutionary effects. To that end, a sky survey of 435 square degrees ( 1.0% of the sky) covering areas with known members of four nearby associations aged 8Myr - 50Myr (Zuckerman and Song 2004) was completed in October and November of 2006. From this, astrometric positions of point sources were then computed and compared with the Two-Micron All Sky Survey (2MASS: 1998-2001) point source catalog. Many known high proper motion objects were recovered as well as previously unpublished objects with J band magnitudes [10, 16] have been identified. Spectroscopy (0.6 - 0.95 micron) of 215 objects (J < 14) was carried out at the CTIO 1.5m telescope from October 2008 through February 2009. We present the proper motion and spectroscopy results including more than two dozen previously unidentified late M dwarfs and subdwarfs.
Gizis John E.
Shaw John D.
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