Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..427c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 427-455. Research supported by the Smithsonian Instit
Astronomy and Astrophysics
Astrophysics
174
Astronomical Catalogs, O Stars, X Ray Sources, X Ray Spectra, Heao 2, Stellar Luminosity, Stellar Mass, Variable Stars
Scientific paper
A catalog of X-ray count rates for all O-type stars surveyed by the Einstein Observatory is presented. The procedures by which the IPC and High Resolution Imager rates are converted to emitted X-ray luminosities are discussed in detail. The catalog contains 289 stars with 89 detections and 176 upper bounds for the observed count rates. Precise positions for 43 O-type stars are given whose previously known locations were unknown or erroneous. It is argued that most O-type stars are X-ray point sources, but some are possibly embedded in extended nebulae and/or bubbles. The X-ray spectra of O-type stars are discussed briefly, and it is argued that their mean spectrum can reasonably be taken as an 0.5 keV thermal bremsstrahlung model. It is argued that at least 30 percent of all O-type stars are variable in X-rays.
Chlebowski Tomasz
Harnden Frank R. Jr.
Sciortino Salvatore
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