J/AJ/124/404 Upper Scorpius OB association Lithium survey. II. (Preibisch, 2002)
Exploring the full stellar population of the Upper Scorpius OB association.
Preibisch T., Brown A.G.A., Bridges T., Guenther E., Zinnecker H.
<Astron. J. 124, 404 (2002)>
=2002AJ....124..404P 2002AJ....124..404P
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Equivalent widths
Keywords: open clusters and associations: individual (Upper Scorpius) -
stars: formation - stars: luminosity function, mass function -
stars: pre-main-sequence
Abstract:
We investigate the stellar population and star formation history of
the Upper Scorpius OB association, the most nearby region of recent
massive star formation, over the full stellar mass range from 0.1 to
20M☉. The first part of this paper describes an extension of our
large spectroscopic survey (Preibisch et al., published in
2001, Cat. J/AJ/121/1040) for low-mass pre-main-sequence (PMS) stars
in Upper Scorpius. Using the multiobject spectrograph 2dF at the
Anglo-Australian Telescope, we obtained spectra of 469 stars with
magnitudes R=12.5-18.0 in a 6°2 area, on he nights of 2001 May
16-17. Among these, we find 68 new PMS stars, nearly all of them
M-type stars, by their strong lithium absorption lines. The total area
covered by our 2dF survey is now 9 deg2 and contains 166 new PMS
stars. Combining these results with our earlier investigation
(Preibisch & Zinnecker, 1999AJ....117.2381P 1999AJ....117.2381P) yields a sample of 250
PMS stars in the mass range ∼0.2 to ∼2M☉.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 166 PMS stars in Upper Scorpius detected in
our 2dF survey
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See also:
J/A+A/333/619 : Upper Scorpius OB association Lithium survey (Preibisch+ 1998)
J/AJ/121/1040 : PMS members of upper Scorpius OB association (Preibisch+ 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [USco-]
6- 20 A15 --- [PBB2002] Source name, USco-HHMMSS.s+DDMMSS (1)
22- 25 F4.1 mag Rmag The R-band magnitude
27- 30 F4.2 0.1nm EWLi Li (6708 Å) Equivalent Width
32- 37 F6.1 0.1nm EWHa Hα Equivalent Width
39- 40 A2 --- SpType Spectral type
42- 44 F3.1 mag AV The V-band extinction
46- 50 F5.3 [K] log(T) Log of the adopted effective temperature
52- 56 F5.2 [solLum] log(Lbol) Log of the bolometric luminosity
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Note (1): The source name in the first column consists of the J2000 coordinates
of the star. Identified as [PBB2002] USco JHHMMSS.s+DDMMSS in Simbad.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 27-Sep-2002