SIMBAD references

2001AJ....121.1040P - Astron. J., 121, 1040-1049 (2001/February-0)

A large spectroscopic survey for young low-mass members of the Upper Scorpius OB association.


Abstract (from CDS):

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 M≲M*≲0.5 M) members is at least as high as expected from the known number of high-mass (M*≳3 M) 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.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Scorpius-Centaurus - stars: mass function - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/AJ/121/1040): table1.dat>

Nomenclature: Table 1: [PGZ2001] JHHMMSS.s-DDMMSS N=98.

Simbad objects: 119

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