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

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

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545530p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #455.30; Bulletin of the American Astronomical Society, Vol. 42, p.477

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 5-20 Myr), we present results from a low-resolution optical spectroscopy survey of 200 F-type members of Sco-Cen selected via their convergent proper motions. Using low-resolution spectra over red ( 5700A-6800A) and blue ( 3700A-5300A) wavelengths obtained using the SMARTS 1.5-m telescope, we determined accurate MK spectral classifications and searched for evidence of accretion among these intermediate-mass stars ( 1.3-2 Msun). Combining the spectral types, revised Hipparcos trigonometric parallaxes, and Hipparcos and 2MASS photometry, we obtain luminosities for these stars, and estimate their masses and ages through interpolation of published evolutionary tracks. 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 F-type stars in the 5-20 Myr range.

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