2001PASP..113..970H -
Publ. Astron. Soc. Pac., 113, 970-973 (2001/August-0)
The accretion disk and white dwarf during the quiescence of the dwarf novae VW Vulpeculae and χ Leonis.
HENRY C.K. and SION E.M.
Abstract (from CDS):
We have carried out an International Ultraviolet Explorer archival comparative study of the two U Geminorum type dwarf novae VW Vulpeculae and χ Leonis. The spectrum of χ Leo does not show any C IV, a feature normally seen in the vast majority of other dwarf novae. For VW Vul, a single-temperature high-gravity photosphere does not produce a consistent fit. The best-fit accretion disk model corresponds to Mwd=0.55 M☉, i=41°, and M{dot}=10–9 M☉.yr–1. For χ Leo, we find that a white dwarf model with Teff=33,000 K gives the best fit to the far-UV spectrum. However, a model accretion disk with parameters M=0.80 M☉, i=60°, and M{dot}=10–10 M☉.yr–1 also gives a satisfactory fit to the far-UV continuum. However, the accretion rate derived for VW Vul is within a factor of 3 of the critical value, while the accretion rate of χ Leo is within a factor of 60 of the critical rate. If we have identified the accreting white dwarf in χ Leo, then it strengthens the overall conclusion that the white dwarfs in cataclysmic variables above the period gap appear to be a factor of 1.5-2 times hotter than the accreting white dwarfs in dwarf novae below the period gap.
Abstract Copyright:
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Journal keyword(s):
Stars: Novae, Cataclysmic Variables - stars: individual (VW Vulpeculae) - stars: individual (χ Leonis)
Errata:
erratum vol.113, p.1156 (2001)
Simbad objects:
4
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