open clusters and associations: individual: Trumpler 16; stars: massive
Abstract :
[en] We have developed lists of likely B3-A0 stars (called "late B" stars) in the young cluster Trumpler 16. The following criteria were used: location within 3' of η Car, an appropriate V and B - V combination, and proper motion (where available). Color and magnitude cuts have been made assuming an E(B - V) = 0.55 mag ± 0.1, which is a good approximation close to the center of Trumpler 16. These lists have been cross-correlated with X-ray sources found in the Chandra Carina Complex Project. Previous studies have shown that only very rarely (if at all) do late main-sequence B stars produce X-rays. We present evidence that the X-ray-detected sources are binaries with low-mass companions, since stars less massive than 1.4 M [SUB]sun[/SUB] are strong X-ray sources at the age of the cluster. Both the median X-ray energies and X-ray luminosities of these sources are in good agreement with values for typical low-mass coronal X-ray sources. We find that 39% of the late B stars based on a list with proper motions have low-mass companions. Similarly, 32% of a sample without proper motions have low-mass companions. We discuss the X-ray detection completeness. These results on low-mass companions of intermediate-mass stars are complementary to spectroscopic and interferometric results and probe new parameter space of low-mass companions at all separations. They do not support a steeply rising distribution of mass ratios to low masses for intermediate-mass (5 M [SUB]sun[/SUB]) primaries, such as would be found by random pairing from the initial mass function. Based on observations made with the Chandra X-ray Observatory.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Evans, Nancy Remage; Smithsonian Astrophysical Observatory, MS 4, 60 Garden Street, Cambridge, MA 02138, USA
DeGioia-Eastwood, Kathleen; Department of Physics and Astronomy, Northern Arizona University, Box 6010, Flagstaff, AZ 86011-6010, USA
Gagné, Marc; Department of Geology and Astronomy, West Chester University, West Chester, PA 19883, USA
Townsley, Leisa; Department of Astronomy & Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA
Broos, Patrick; Department of Astronomy & Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA
Wolk, Scott; Smithsonian Astrophysical Observatory, MS 70, 60 Garden Street, Cambridge, MA 02138, USA
Nazé, Yaël ; GAPHE Departement AGO, Universite de Liege, Allee du 6 Aout 17, Bat. B5C, B4000-Liege, Belgium
Corcoran, Michael; NASA's Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA
Oskinova, Lida; Institute for Physics and Astronomy, University Potsdam, 14476 Potsdam, Germany
Moffat, Anthony F J; Dept. de Physique, Univ. de Montreal, CP 6128 Succ. A. Centre-Ville, Montreal, QC H3C 3J7, Canada
Wang, Junfeng; Smithsonian Astrophysical Observatory, MS 06, 60 Garden Street, Cambridge, MA 02138, USA
Walborn, Nolan R; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Language :
English
Title :
The Search for Low-mass Companions of B Stars in the Carina Nebula Cluster Trumpler 16
Publication date :
01 May 2011
Journal title :
Astrophysical Journal Supplement Series
ISSN :
0067-0049
eISSN :
1538-4365
Publisher :
Univ Chicago Press, Chicago, United States - Illinois
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