A Large Spectroscopic Survey for Young Low-Mass Members of the Upper Scorpius OB Association

Details A Large Spectroscopic Survey for Young Low-Mass Members of the Upper Scorpius OB Association A Large Spectroscopic Survey for Young Low-Mass Members of the Upper Scorpius OB Association

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....121.1040p&link_type=abstract

The Astronomical Journal, Volume 121, Issue 2, pp. 1040-1049.

Astronomy and Astrophysics

Astronomy

47

Galaxy: Open Clusters And Associations: Individual: Name: Scorpius-Centaurus, Stars: Mass Function, Stars: Pre-Main-Sequence

Scientific paper

We present the results of a large intermediate-resolution spectroscopic survey for pre-main-sequence (PMS) stars in the Upper Scorpius OB association, the nearest region of recent massive star formation. Utilizing the 2dF multiobject spectrograph at the Anglo-Australian Telescope, we obtained spectra of 576 stars with magnitudes 12.5<=R<=16.5 in a 6 deg2 area in Upper Scorpius. Among these objects we were able to identify 98 new PMS stars, nearly all of them M-type stars, by their strong lithium absorption lines. We place the new PMS stars into the H-R diagram and find that their ages agree well with the mean age of 5 Myr determined in our earlier investigation based on a smaller sample of stars. The number of low-mass (0.1 Msolar<~M*<~0.5 Msolar) members is at least as high as expected from the known number of high-mass (M*>~3 Msolar) association members and from recent determinations of the field star initial mass function. Thus, there is no deficit of low-mass stars in Upper Scorpius.

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