Abstract
X-ray observations of novae, nova-like variables, and dwarf novae in outburst show them to be weaker X-ray sources than predicted by boundary layer models. The discrepancy can be resolved if these systems have optically thick boundary layers with temperatures less than 30 eV, provided the neutral hydrogen column densities of circumstellar gas are greater than 1021 cm -2. The absorption of greater than 99 percent of the flux from the boundary layer must occur in a region nearer the white dwarf than the region in which spectral lines are formed. The weak hard X-ray fluxes observed from these systems probably do not come from the boundary layer but may be produced in an accretion disk corona.
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Jensen, K.A. (2000). Boundary Layers and Coronae in Cataclysmic Variables. In: Lamb, D.Q., Patterson, J. (eds) Cataclysmic Variables and Low-Mass X-Ray Binaries. Astrophysics and Space Science Library, vol 113. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5319-2_48
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DOI: https://doi.org/10.1007/978-94-009-5319-2_48
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