Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730705s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #307.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astrophysics
Scientific paper
Young stars free of the obscuring effects of their formation region exist in the Solar neighborhood as members of co-moving, coeval groups known as nearby young moving groups (NYMGs). Since identification of new members has relied on magnitude limited surveys, NYMGs are mostly F, G, and K type stars, with only the nearest M type members being represented. Thus, the census of known members is probably incomplete. NYMG members are important because they provide: 1) Well characterized samples of nearby young stars for study of their physical and kinematic properties, and 2) Prime targets for direct exoplanet imaging. We have therefore developed a general technique to identify low-mass candidates of NYMGs using proper motion and photometry. Candidates are then screened for secondary evidence of group membership, such as indicators of youth and consistent radial velocity, to identify likely new group members. Here we present results from our survey of Beta Pictoris ( 10 Myr) and AB Doradus ( 70 Myr) NYMG candidates. Our technique has identified more than 30 low-mass likely members of these groups with spectral types later than K3. Among the likely new members are many visual binaries and objects that are potentially benchmark young brown dwarfs. Our expanded member sample has also allowed us to begin studying the astrophysics of young late-type objects including binary properties and spectroscopic gravity indicators.
Lepine Sebastien
Rice Emily
Schlieder Joshua E.
Simon Manfred
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