Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296...25w&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 25-30 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
13
H Alpha Line, Stellar Luminosity, Stellar Winds, X Ray Binaries, B Stars, Emission Spectra, Infrared Spectra, Variable Stars, White Dwarf Stars
Scientific paper
The X-ray behavior of Be/X-ray binaries is discussed. The structure of the stellar winds of the Be stars is considered. It is shown that the X-ray luminosities can be understood if the neutron star is embedded in a slowly expanding, dense equatorial wind. The presence of such a wind can be inferred from the H alpha emission and the IR excess. The shapes of the X-ray light curves are interpreted. Large orbital modulations of the X-ray luminosity are caused by orbital motion in a wind with an outflow velocity much larger than the orbital velocity of the neutron star. Small orbital modulations result from outflow velocities that are smaller than the orbital velocity of the neutron star. The distribution of Be/X-ray binaries in the orbital versus spin period diagram can be explained. The possibility of detecting Be+white dwarf systems in X-rays is briefly discussed, and some candidate systems are given.
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