A spherical model for the transient X-ray source A0620-00

Details A spherical model for the transient X-ray source A0620-00 A spherical model for the transient X-ray source A0620-00

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..339d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 339-345.

Astronomy and Astrophysics

Astronomy

Astronomical Models, Stellar Mass Accretion, X Ray Sources, Continuous Spectra, Neutron Stars, White Dwarf Stars

Scientific paper

The continuum spectrum of the transient X-ray source A0620-00 from infrared to X-ray frequencies is interpreted as emission from a uniform spherical cloud of hot gas in which the free-free spectrum is modified by Thomson scattering. On this basis, the radius and density of the cloud, and the distance of the source, are derived. The change of the spectrum with time indicates a decrease of both radius and density with decreasing luminosity. Considering the production of X-rays to be due to impulsive accretion in a low-mass binary system, these results open the question as to whether the accreting object is a white dwarf rather than a neutron star.

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