Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..691h&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Oct.-Nov. 1980, p. 691-695.
Astronomy and Astrophysics
Astronomy
6
Binary Stars, Early Stars, Neutron Stars, Stellar Spectra, Stellar Winds, X Ray Sources, Heao 1, Hot Stars, Stellar Luminosity, Supermassive Stars, X Ray Binaries
Scientific paper
Fourteen early-type stars representative of systems which may be harboring a neutron star companion and are thus potential progenitors of massive X-ray binaries have been examined for X-ray emission with the HEAO A-1 experiment. Limits on the 0.5-20 keV luminosity for these objects lie in the range 10 to the 31-33 erg/sec. In several cases, the hypothesis of a collapsed companion, in combination with the X-ray limit, places a serious constraint on the mass-loss rate of the primary star. In one instance, an X-ray source was discovered coincident with a candidate star, although the luminosity of 5 x 10 to the 31 is consistent with that expected from a single star of the same spectral type. The prospects for directly observing the quiescent phase of a binary X-ray source with the Einstein Observatory are discussed in the context of these results.
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