Key points are not available for this paper at this time.
Soft X-ray (0. 2-3. 5 keV) measurements for all normal, massive, O-type stars surveyed with the Einstein Observatory are presented as a catalog containing 89 detections and 176 upper bounds, together with a detailed discussion of the reduction process. Among the detections are 42 newly identified X-ray sources, several of them in heavily obscured regions. Values of Lₓ_/Lbol_, listed for most stars, range from 10^-5. 44^ to 10^-7. 35^; Lₓ_ spans more than 3 orders of magnitude, ranging from 1. 5 x 10³1^ to 2 x 10³4^ ergs s^-1^. It is noted that at least 30% of O-type stars are variable in X-rays, but that there is little evidence for new objects whose X-ray emission might be significantly enhanced by accretion processes onto a neutron star.
Chlebowski et al. (Thu,) studied this question.