Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8811580v&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Red Shift, Stellar Spectra, Ultraviolet Astronomy, Cataclysmic Variables, Dwarf Novae, Iue, Mass Transfer, White Dwarf Stars
Scientific paper
The reddening of 51 cataclysmic variable to 51 systems is determined from the 2200 A feature. Spectral flux distribution does not depend on system type, orbital period or (for dwarf novae) average length of interval between outburst maxima; it does not depend strongly on inclination, except in DQ Her systems, which may have relatively low fluxes at short wavelengths as compared to the other systems. All systems show variability on a time scale of hours. In two nova-like variables in a low state and in five dwarf novae in quiescence there is evidence that most of the ultraviolet flux at short wavelengths is due to the white dwarf. Disk model spectra are calculated to show that the slope of the spectrum depends strongly on the white dwarf mass. Hence determinations of the mass transfer rate from the spectral slope are subject to large errors in cases where the white dwarf mass is not known.
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