Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976s%26t....52..243l&link_type=abstract
Sky and Telescope, vol. 52, Oct. 1976, p. 243-246, 261.
Astronomy and Astrophysics
Astronomy
Black Holes (Astronomy), Globular Clusters, Neutron Stars, X Ray Astronomy, X Ray Sources, Compton Effect, Earth Magnetosphere, Polarimetry, Satellite Observation, Spaceborne Astronomy, Stellar Mass, X Ray Scattering
Scientific paper
The article focuses on the following recent developments in X-ray astronomy: measurements of neutron star masses, the discovery of sources of rapidly repetitive X-ray bursts, new observations of the black-hole candidate Cygnus X-1, and X-ray polarimetry. The X-ray satellites currently in orbit are identified along with their distinguishing characteristics, and seven types of X-ray sources are delineated. Determinations of the masses of the neutron stars in Vela X-1 and Hercules X-1 are discussed, characteristics of the X-ray burster MXB 1730-335 are described, and it is shown that the bursts can be interpreted in terms of sporadic precipitation of plasma from a reservoir in the magnetosphere surrounding a magnetized neutron star. Additional evidence is presented in favor of the position that Cygnus X-1 is a black hole, and an explanation based on inverse Compton scattering is offered for the alternation of this source between a 'low' state and a 'high' state. Principles and possible applications of X-ray polarimetry are examined.
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