Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.229h&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 229-231 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
10
Cataclysmic Variables, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, White Dwarf Stars, Absorption Spectra, Stellar Models, Ultraviolet Spectroscopy
Scientific paper
Far ultraviolet IUE spectra of WZ Sge from July 1979 through Nov. 1981 were studied to search for the spectroscopic signature of the white dwarf primary. The ultraviolet fluxes continue to decline throughout this period. The ultraviolet spectrum of WZ Sge near minimum is not completely consistent with the hypothesis that the white dwarf is visible, although the ultraviolet energy distribution can be matched by a DA-type white dwarf. This does not explain the behavior of the absorption spectrum. However, the accretion on the top of the atmosphere of material having normal metal abundances might greatly alter the appearance of the spectrum. Development of model atmospheres having solar abundances for white dwarfs is recommended to investigate this possibility. Models of white dwarfs heated by a bright accretion disk are also needed to determine whether this mechanism could cause the surface temperature to be high for several years after the outburst.
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