Abstract
Ultraviolet light curves have been obtained for the quiescent dwarf novae U Gem and VW Hyi. The amplitude of the hump associated with the accretion hot spot is much smaller in the UV than in the visible. This implies that the bright spot temperature is roughly 12000 K if it is optically thick. A hotter spot would have to be optically thin in the near UV. The flux distribution of U Gem in quiescence cannot be fitted by model spectra of steady state, viscous accretion disks. The absolute luminosity, the flux distribution, and the far UV spectrum suggest that the primary star is visible in the far UV. The optical-UV flux distribution of VW Hyi could be matched roughly by our model accretion disks, but the fitting is poorly constrained due to the uncertainty in its distance.
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© 1982 D. Reidel Publishing Company
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Wu, CC., Panek, R.J., Holm, A.V., Schiffer, F.H. (1982). Ultraviolet Light Curves of U Geminorum and VW Hydri. In: Kopal, Z., Rahe, J. (eds) Binary and Multiple Stars as Tracers of Stellar Evolution. Astrophysics and Space Science Library, vol 98. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7861-4_24
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DOI: https://doi.org/10.1007/978-94-009-7861-4_24
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