Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..621p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, April 1, 1984, p. 621-635.
Astronomy and Astrophysics
Astronomy
11
Bursts, Flare Stars, Neutron Stars, Stellar Radiation, X Ray Sources, Absorption Spectra, Binary Stars, Heao 2, Stellar Mass Accretion, Stellar Spectra
Scientific paper
The first time-resolved X-ray spectral data of the periodic transient source A0538-66 were collected with the monitor proportional counter on the Einstein Observatory in the winter of 1980-81. The low energy absorption of the spectrum is substantial and is strongly anticorrelated with source intensity. This behavior, and the unexpected thermal nature of the spectrum, can be understood in terms of an accreting neutron star surrounded by a hot Alfven shell and enveloped, during its periastron passage, in the distended atmosphere of its B star companion. The X-ray emission from such a system would be beamed, so that the remarkably high apparent luminosity of the source, based on the assumption of isotropy, is probably an overestimate.
Bedford David K.
Ponman Trevor J.
Skinner Gerald K.
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