Ultraviolet behavior of SS Cygni in quiescence and in outburst

Details Ultraviolet behavior of SS Cygni in quiescence and in outburst Ultraviolet behavior of SS Cygni in quiescence and in outburst

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..455g&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 455-45

Astronomy and Astrophysics

Astrophysics

4

Dwarf Novae, Stellar Activity, Stellar Spectra, Ultraviolet Spectra, Accretion Disks, Iue, Stellar Models

Scientific paper

The dwarf nova SS Cygni was observed by IUE. The UV low resolution spectra show clear differences in the behavior of the accretion disk in quiescence and in outburst. A steady-state disk model can almost fit the continuum of the outburst spectra, while it fails the fit during quiescence phases. In quiescence, accretion disk behavior preserves memory of the preceding outburst. This memory is revealed from a different modulation of the continuum and of the total absolute fluxes of the emission lines versus the orbital period depending on the type of the preceding outburst. The He II 1640 A quiescent equivalent width behavior shows a large spread (0.93 to 23 A), which is consistent with models.

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