Alexandra C. Bisol, Patrick Godon, Edward M. Sion
We have selected three nova-like variables at the long period extreme of
nova-like orbital periods: V363 Aur, RZ Gru and AC Cnc, all with IUE archival
far ultraviolet spectra. All are UX UMa type nova-like variables and all have
$P_{orb} > 7$h. V363 Aur is a bona fide SW Sex star, and AC Cnc is a probable
one, while RZ Gru has not proven to be a member of the SW Sex subclass. We have
carried out the first synthetic spectral analysis of far ultraviolet spectra of
the three systems using state-of-the-art models both of accretion disks and
white dwarf photospheres. We find that the FUV spectral energy distribution of
both V363 Aur and RZ Gru are in agreement with optically thick steady state
accretion disk models in which the luminous disk accounts for 100% of the FUV
light. We present accretion rates and model-derived distances for V363 Aur and
RZ Gru. For AC Cnc, we find that a hot accreting white dwarf accounts for
$\sim$ 60% of the FUV light with an accretion disk providing the rest. We
compare our accretion rates and model-derived distances with estimates in the
literature.
View original:
http://arxiv.org/abs/1112.3711
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