The mystery of the missing boundary layer

Details The mystery of the missing boundary layer The mystery of the missing boundary layer

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262l..53f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 262, Nov. 15, 1982, p. L53-L58. U.S.-Israel Binational Science Found

Astronomy and Astrophysics

Astronomy

64

Binary Stars, Novae, Stellar Mass Accretion, Ultraviolet Astronomy, X Ray Sources, Accretion Disks, Boundary Layers, Far Ultraviolet Radiation, Stellar Models

Scientific paper

The question of the nature of the ultraviolet and X-ray radiation field of cataclysmic binaries is addressed. The spectrum and luminosity of this radiation are important in determining the mass transfer rate and energy budget of the system and in studies of the ejecta surrounding novae. In many systems, the soft X-ray luminosity is approximately 100-10,000 times weaker than predicted by simple accretion models. Several possible solutions to this discrepancy are discussed. The most likely are either that the optical luminosity of a typical old nova is produced partly by reprocessed ultraviolet light from the white dwarf, or that the boundary layer, where accreted matter settles onto the white dwarf, is both larger and more complicated than predicted by existing accretion disk models. The solution to this problem is of fundamental importance to accretion disk theory and will have implications for the study of most aspects of these systems, including models of the nova outburst itself.

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