Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apl....17..131e&link_type=abstract
Astrophysical Letters, vol. 17, no. 3, 1976, p. 131-135.
Astronomy and Astrophysics
Astrophysics
13
Astronomical Models, Companion Stars, Mass Transfer, Novae, White Dwarf Stars, X Ray Sources, Luminous Intensity, Radiant Flux Density, Stellar Atmospheres, X Ray Irradiation
Scientific paper
A model is proposed for the transient X-ray source A0620-00 involving a white dwarf accreting mass from a late-type subgiant companion. The transient behavior of the X-ray source is explained by the instability to mass loss of the companion (as in Algol-type binaries). The brightening, spectrum, and decay timescale of the optical counterpart are explained in terms of re-emission of X-radiation intercepted by the subgiant. A0620-00 should provide an excellent test case for numerical models of stellar atmospheres irradiated by an external X-ray flux.
Devinney Edward J. Jr.
Endal Andrew S.
Sofia Sabatino
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