Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aas..meet.....j&link_type=abstract
American Astronomical Society, Meeting, Cambridge, MA, Jan. 28-30, 1980, Paper. 13 p. Research supported by the United States-Is
Astronomy and Astrophysics
Astronomy
Astronomical Models, Galactic Radiation, Neutron Stars, Pulsars, X Ray Sources, Binary Stars, Galactic Bulge, Luminous Intensity, Satellite Observation, Stellar Magnetic Fields, Thermal Emission
Scientific paper
Attention is given to those compact galactic X-ray sources whose X-ray luminosities are considerably in excess of the solar luminosity. It is pointed out that the key breakthrough in the development of an understanding of compact galactic X-ray sources was the discovery of X-ray pulsars with the UHURU satellite. There is now overwhelming evidence that these objects are neutron stars in close binary stellar systems. The X-ray pulsations are thought to be thermal emission from the magnetic polar caps of a neutron star that is accreting matter from a companion star and whose magnetic field is misaligned with its rotation axis. Among the compact galactic X-ray sources that are not X-ray pulsars, some still show direct evidence of binary membership, such as X-ray eclipses. There is evidence that the galactic-bulge sources are, in fact, close binary stellar systems. It is concluded, that the great majority of bright galactic X-ray sources, with only a tiny handful of exceptions (such as the Crab and Vela pulsars), are likely to be binaries.
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