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J/AJ/121/1040   PMS members of upper Scorpius OB association (Preibisch+, 2001)

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
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 6°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≲M*≲0.5M_☉) members is at least as high as expected from the known number of high-mass (M*≳3M) 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 38 100 Li-rich stars in Upper Scorpius detected in our 2dF survey
See also: J/A+A/333/619 : Upper Scorpius OB association Lithium survey (Preibisch+ 1998) J/AJ/124/404 : Upper Scorpius OB association Lithium survey. II. (Preibisch, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- 2dF [2dF] 4- 18 A15 --- [PGZ2001] Star name (1) 20- 23 F4.2 0.1nm EWLi Li 6708Å equivalent width (in Å) 24 A1 --- u_EWLi Uncertainty flag on EWLi 26- 30 F5.1 0.1nm EWHa Hα equivalent width (in Å) 31 A1 --- u_EWHa Uncertainty flag on EWHa 33- 35 A3 --- SpType Spectral type 36 A1 --- u_SpType Uncertainty flag on SpType 38 A1 --- f_[PGZ2001] Flag on [PGZ2001] (2)
Note (1): Position coordinates in [PGZ2001] are in a HHMMSS.s-DDMMSS format. In Simbad, the are identified as [PGZ2001] JHHMMSS.s-DDMMSS Note (2): Star with a strongly veiled spectrum. Object might be identical to RXJ 1614.3-1906b from Martin et al. (1998AJ....115..351M)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 07-Oct-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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