Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-07-07
Astronomy and Astrophysics
Astrophysics
LATEX text (aaspp4 style) and 7 postscript figures. Accepted for publication in the Astronomical Journal, October 1997. Also a
Scientific paper
10.1086/118584
We report on optical identifications of X-ray sources in the vicinity of the R~CrA association. We identify 11 low-mass pre-main-sequence stars as counterparts of 9 X-ray sources. We also find X-ray emission from coordinates consistent with the position of 3 bright late-B stars, although the emission may come from lower mass companions. The X-ray-selected stars lie along a narrow locus in the luminosity-temperature diagram at an age of about 7~Myr, which is considerably older than the estimated ages of the higher mass stars or of the IR-excess stars. We determine the physical characteristics of these stars, including masses, ages, and Lithium abundances. We estimate that the complete membership of the R~CrA association amounts to about 90 stars, mostly older naked T~Tauri stars, and that the population is consistent with the standard IMF.
Mathieu Robert D.
Neuhäuser Ralph
Vrba Fred J.
Walter Fred M.
Wolk Scott J.
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