X-ray properties of bright OB-type stars detected in the ROSAT all-sky survey.

Details X-ray properties of bright OB-type stars detected in the ROSAT all-sky survey. X-ray properties of bright OB-type stars detected in the ROSAT all-sky survey.

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322..167b&link_type=abstract

Astronomy and Astrophysics, v.322, p.167-174

Astronomy and Astrophysics

Astrophysics

176

Stars: Early-Type, X-Rays: Stars, Stars: Mass Loss

Scientific paper

The ROSAT all-sky survey has been used to study the X-ray properties for all OB-type stars listed in the Yale Bright Star Catalogue. Here we present a detailed astrophysical discussion of our analysis of the X-ray properties of our complete sample of OB-type stars; a compilation of the X-ray data is provided in an accompanying paper (Berghoefer, Schmitt & Cassinelli 1996A&AS..118..481B). We demonstrate that the ``canonical'' relation between X-ray and total luminosity of L_x_/L_Bol_=~10^-7^ valid for O-type stars extends among the early B-type stars down to a spectral type B1-B1.5; for stars of luminosity classes I and II the spectral type B1 defines a dividing line for early-type star X-ray emission. We discuss the X-ray properties of X-ray detected B2-B9 stars (LC III-V) in the context of possible companions. We also compare our results to the results obtained from Einstein Observatory data and ROSAT pointed observations. We show for our sample of stars that X-ray variability is generally not common for O-type stars as well as early B-type stars.

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