Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..569k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 569-576.
Astronomy and Astrophysics
Astronomy
44
Stellar Evolution, Stellar Spectra, Ultraviolet Spectra, White Dwarf Stars, Continuous Radiation, Emission Spectra, Flux Density, Iue, Line Spectra, Ultraviolet Astronomy
Scientific paper
This paper examines the ultraviolet evolution of the dwarf nova U Gem from one outburst to the next. A series of seven sets of IUE observations that monitor the quiescent period of 22-103 days after outbursts is presented. An eighth set of observations obtained 75 days after the second outburst is included for comparison. In agreement with earlier studies, analyses of Ly-alpha profiles and 1200-2000-A continuum spectra during 103 days of quiescence are consistent with the presence of a 30,000 K white dwarf. Direct evidence is provided that the UV flux levels continue to decrease throughout optical quiescence. These changes in flux appear consistent with the added presence of a hot component (perhaps the inner part of the disk or boundary layer) in addition to the white dwarf. Analyses of the absorption line spectra are also inconsistent with a single photospheric origin.
Kiplinger Alan L.
Sion Edward M.
Szkody Paula
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