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Ultraviolet light curves of U Geminorum and VW HydriUltraviolet light curves were 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. 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 can be matched roughly by the model accretion disks.
Document ID
19820013243
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Wu, C. C. (Computer Sciences Corp. Silver Spring, MD, United States)
Panek, R. J. (Computer Sciences Corp. Silver Spring, MD, United States)
Holm, A. V. (Computer Sciences Corp. Silver Spring, MD, United States)
Schiffer, F. H., III (Computer Sciences Corp. Silver Spring, MD, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1981
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:168683
NASA-CR-168683
Accession Number
82N21117
Funding Number(s)
CONTRACT_GRANT: NAS5-25774
CONTRACT_GRANT: NASW-3254
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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