FUSE Observations of the Dwarf Nova EM Cygni

Details FUSE Observations of the Dwarf Nova EM Cygni FUSE Observations of the Dwarf Nova EM Cygni

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..330..351w&link_type=abstract

The Astrophysics of Cataclysmic Variables and Related Objects, Proceedings of ASP Conference Vol. 330. Edited by J.-M. Hameury a

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

FUSE observations of the eclipsing, double-lined dwarf nova EM Cygni reveal a complex spectrum, exhibiting the usual C III and O VI lines plus a host of unidentified absorption and emission features. Our initial attempts at fitting the continuum with a white dwarf plus accretion disk model only crudely match the observations and thus only provide a rough estimate of the mass-accretion rate and the white dwarf temperature. Using the observed FUV lines we measure the orbital velocity of the white dwarf finding K1 ˜131 km/s, allowing us to revise the system parameters. Most notably, we find a mass ratio q=0.65, much lower than previous estimates.

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