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Ultraviolet Light Curves Of U Geminorum and VW Hydri

Published online by Cambridge University Press:  12 April 2016

Chi-Chao Wu ,
R.J. Panek ,
A.V. Holm  and
F.H. Schiffer III
Chi-Chao Wu
Affiliation:
Computer Sciences Corporation, Silver Spring, Md., U.S.A.
R.J. Panek
Affiliation:
Computer Sciences Corporation, Silver Spring, Md., U.S.A.
A.V. Holm
Affiliation:
Computer Sciences Corporation, Silver Spring, Md., U.S.A.
F.H. Schiffer III
Affiliation:
Computer Sciences Corporation, Silver Spring, Md., U.S.A.

Abstract

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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.

Type
Part III: Evolutionary Processes in Close Binary Systems
Information
International Astronomical Union Colloquium , Volume 69: Binary and Multiple Stars as Tracers of Stellar Evolution , 1982 , pp. 191 - 197
Copyright
Copyright © Reidel 1982

References

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