Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..997k&link_type=abstract
Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 997-1015.
Astronomy and Astrophysics
Astrophysics
74
Astronomical Spectroscopy, Binary Stars, Dwarf Stars, Stellar Luminosity, Stellar Mass Accretion, Balmer Series, Disks (Shapes), Spectral Energy Distribution, Spectrum Analysis, Stellar Models, Stellar Rotation
Scientific paper
Absolute spectrophotometric observations of the dwarf nova SS Cygni have been obtained at maximum light, during the subsequent decline, and at minimum light. In order to provide a critical test of accretion disk theory, a model for a steady-state α-model accretion disk has been constructed which utilizes a grid of stellar energy distributions to synthesize the disk flux. Physical parameters for the accretion disk at maximum light are set by estimates of the intrinsic luminosity of the system that result from a desynthesis of a composite minimum light energy distribution. At maximum light, agreements between observational and theoretical continuum slopes and the Balmer jump are remarkably good. The model fails, however, during the eruption decline and at minimum light. It appears that the physical character of an accretion disk at minimum light must radically differ from the disk observed at maximum light.
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