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Models for Compact X-Ray Sources

Published online by Cambridge University Press:  14 August 2015

E. E. Salpeter
E. E. Salpeter*
Affiliation:
Cornell University, Ithaca, N.Y., U.S.A.

Abstract

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A statistical analysis of the UHURU catalogue of X-ray sources leads to the following conclusions. If the weak sources are omitted, there is a strong concentration to low galactic latitude but the absence of a strong background and the presence of some strong sources at low galactic longitude indicate an appreciable number of sources of luminosity L ∼ 104L⊙ in the vicinity of the ‘nuclear bulge’. This region generally suggests ‘stellar population II’ and therefore stars of small mass. However, there is some suggestion of a second class of sources, distributed in the galactic plane like ‘stellar population I’ and suggesting large stellar masses.

There are three possible types of simple X-ray spectra, (a) optically thin bremsstrahlung, (b) black-body spectrum, and (c) power-law spectra. In this talk only theoretical models for type (a) are reviewed, including accretion, rotation and vibration for a white dwarf star and cocoons around a neutron star.

Type
Part II: Theoretical Models for Compact Sources
Information
Symposium - International Astronomical Union , Volume 55: X- and Gamma-Ray Astronomy , 1973 , pp. 135 - 142
Copyright
Copyright © Reidel 1973 

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