The Star-formation History and Accretion Disk Fraction Among the Low-Mass Members of the Scorpius-Centaurus OB Association

Details The Star-formation History and Accretion Disk Fraction Among the Low-Mass Members of the Scorpius-Centaurus OB Association The Star-formation History and Accretion Disk Fraction Among the Low-Mass Members of the Scorpius-Centaurus OB Association

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932705p&link_type=abstract

American Astronomical Society, AAS Meeting #219, #327.05

Astronomy and Astrophysics

Astronomy

Scientific paper

As part of a long-term observing program to elucidate the membership, star-formation history, and substructure of the nearest OB association (Sco-Cen; d = 100-150 pc; ages 10-20 Myr), we present results from a low-resolution optical spectroscopy survey of 363 G/K/M-type candidates of Sco-Cen selected via X-ray activity, proper-motions, and 2MASS photometry consistent with membership. Using low-resolution spectra over red ( 5700A-6800A) wavelengths obtained using the SMARTS 1.5-m telescope, we measured Li equivalent widths, determined accurate MK spectral classifications and searched for evidence of accretion among these low-mass stars ( 0.6-1.1 Msun). Using Li as a youth indicator, we evaluate membership and place each confirmed member on the H-R diagram. Combining these results with previously published results for the higher- and lower-mass stars, we discuss the substructure, age distribution, and kinematics of the Sco-Cen OB association, as well as the accretion disk fraction amongst young G/K/M-type stars in the 10-20 Myr range. This work has been supported by NSF grant AST-1008908.

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