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The Chandra survey of Carina OB stars

Published online by Cambridge University Press:  12 July 2011

Marc Gagné ,
Garrett Fehon ,
Michael R. Savoy ,
David H. Cohen ,
Leisa K. Townsley ,
Patrick S. Broos ,
Matthew S. Povich ,
Michael F. Corcoran ,
Nolan R. Walborn  and
Anthony F.J. Moffat
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Marc Gagné
Affiliation:
Dept. of Geology and Astronomy, West Chester Univ., West Chester, PA 19383
Garrett Fehon
Affiliation:
Dept. of Geology and Astronomy, West Chester Univ., West Chester, PA 19383
Michael R. Savoy
Affiliation:
Dept. of Geology and Astronomy, West Chester Univ., West Chester, PA 19383
David H. Cohen
Affiliation:
Dept. of Physics and Astronomy, Swarthmore College, Swarthmore, PA 19081
Leisa K. Townsley
Affiliation:
Dept. of Astronomy & Astrophysics, Penn State Univ., University Park, PA 16802
Patrick S. Broos
Affiliation:
Dept. of Astronomy & Astrophysics, Penn State Univ., University Park, PA 16802
Matthew S. Povich
Affiliation:
Dept. of Astronomy & Astrophysics, Penn State Univ., University Park, PA 16802
Michael F. Corcoran
Affiliation:
CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771
Nolan R. Walborn
Affiliation:
Space Telescope Science Institute, Baltimore, MD 21218, USA
Anthony F.J. Moffat
Affiliation:
Dépt. de Physique, Univ. de Montréal, Succ. Centre-Ville, Montréal, QC, H3C 3J7, Canada
Yael Nazé
Affiliation:
GAPHE, Dépt. AGO, Univ. Liège, Allée du 6 Août 17, Bat. B5C, B4000-Liège, Belgium
Lidia M. Oskinova
Affiliation:
Institute for Physics and Astronomy, Univ. of Potsdam, 14476 Potsdam, Germany
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Abstract

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We have combined 22 deep Chandra ACIS-I pointings to map over one square degree of the Carina complex. Our x-ray survey detects 69 of 70 known O-type stars and 61 of 130 known early B stars. The majority of single O stars display soft X-ray spectra and have a mean log LX/Lbol ≈ −7.5 suggesting shocks embedded in the O-star winds. Over OB stars show unusually high X-ray luminosities, high shock temperatures or time variability, not predicted for embedded wind shocks.

Keywords

X-rays: starsX-rays: binariesstars: early-typestars: pre–main-sequence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 608 - 609
Copyright
Copyright © International Astronomical Union 2011

References

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