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J/AJ/121/1040 PMS members of upper Scorpius OB association (Preibisch+, 2001)
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Beginning of ReadMe :J/AJ/121/1040 PMS members of upper Scorpius OB association (Preibisch+, 2001)
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A large spectroscopic survey for young low-mass members of the
upper Scorpius OB association.
Preibisch T., Guenther E., Zinnecker H.
<Astron. J. 121, 1040 (2001)>
=2001AJ....121.1040P
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ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Equivalent widths
Keywords: open clusters and associations: individual (Scorpius-Centaurus) -
stars: mass function - stars: pre-main-sequence
Abstract:
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 6deg^2^ 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 5Myr determined in our earlier investigation
based on a smaller sample of stars. The number of low-mass
(0.1M_sun_< M*< 0.5M_sun) members is at least as high as expected
from the known number of high-mass (M*> 3M_sun_) 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.