Coordinated X-ray, ultraviolet and optical observations of AM Herculis, U Geminorum, and SS Cygni

Details Coordinated X-ray, ultraviolet and optical observations of AM Herculis, U Geminorum, and SS Cygni Coordinated X-ray, ultraviolet and optical observations of AM Herculis, U Geminorum, and SS Cygni

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..911f&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 911-925. Research supported by the Fundacao de Amparo a Pesquisa do E

Astronomy and Astrophysics

Astronomy

86

Binary Stars, Dwarf Stars, Stellar Spectra, Ultraviolet Astronomy, X Ray Sources, Iue, Novae, Stellar Luminosity, Ultraviolet Spectra, X Ray Spectra

Scientific paper

Simultaneous and quasi-simultaneous optical, UV and X-ray observations of the accreting degenerate dwarf stars AM Herculis, U Geminorum and SS Cygni are reported. The observations were obtained in March 1979, by instruments on board the Einstein Observatory and the IUE satellite, and optical properties were monitored on the ground. AM Her was found to be in a high state at the time of the observations, while SS Cyg and U Gem appeared to be in the optical low state. The presence of a strong UV excess is found in SS Cyg, U Gem and AM Her, which most likely originates from the boundary of the accretion disk in U Gem. The observed excess, with a blackbody component greater than 10 eV, is noted to be inconsistent with standard accretion disk and column models. It is suggested that nuclear burning at the surface of the white dwarf may be responsible for the excess UV flux in the three systems, with differences in spectral distributions resulting from different levels of magnetic field intensity and accretion rate.

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