Abstract
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 ~ 104 L ⊙ 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 II’ 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.
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Salpeter, E.E. (1973). Models for Compact X-ray Sources. In: Bradt, H., Giacconi, R. (eds) X- and Gamma-Ray Astronomy. International Astronomical Union/Union Astronomique Internationale, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2585-0_11
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DOI: https://doi.org/10.1007/978-94-010-2585-0_11
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