Boundary-layer temperatures in high accretion rate cataclysmic variables

Details Boundary-layer temperatures in high accretion rate cataclysmic variables Boundary-layer temperatures in high accretion rate cataclysmic variables

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..452h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 452-459. SERC-supported research

Astronomy and Astrophysics

Astronomy

45

Accretion Disks, Cataclysmic Variables, Dwarf Novae, Radiative Recombination, Stellar Envelopes, Boundary Layers, Stellar Winds, Temperature Distribution, White Dwarf Stars, X Ray Spectra

Scientific paper

The Zanstra method is used to derive limits on boundary-layer temperatures in eclipsing dwarf novae during outburst and nova-like variables, using the observed He II 1640 and 4686 A recombination lines. It is assumed that all the emission is produced in the wind rather than the accretion disk. This method constrains the boundary-layer temperatures to between 50,000 and 100,000 K, depending on the degree of wind bipolarity. These estimates are lower than the T in excess of 200,000 K predicted theoretically. Possible explanations include rapid rotation of the white dwarf and spreading of the boundary layer over the entire white-dwarf surface.

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