A test of synthetic accretion disk spectra using ultraviolet flux distributions of novalike variables

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Accretion Disks, Blue Stars, Cataclysmic Variables, Novae, Stellar Spectrophotometry, Ultraviolet Radiation, Astronomical Models, Optical Thickness, Radiant Flux Density, Spectral Energy Distribution, Stellar Atmospheres, Stellar Color

Scientific paper

Ultraviolet (UV) fluxes and other data for a sample of nine novalike cataclysmic variables are assembled from the literature. The UV fluxes and colors are compared to spectra of steady state model accretion disks, constructed using either Planck functions or model stellar atmosphere spectra as elementary radiators. Deficiencies are found with both sets of models. The restriction to steady state radial temperature profiles is relaxed for the 'stellar atmosphere' disks, but these generalized models still fail to account simultaneously for the absolute UV flux and the UV color of the observed spectra. The conclusion is that stellar atmosphere models do not reflect the physics of disks. More appropriate models probably can and definitely should be made.

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