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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

REFERENCES

Bath, G.T., Pringle, J.E., and Whelan, J.A.J.: 1980, Monthly Notices Roy. Astron. Soc. 190, p. 185.Google Scholar
Boggess, A., et al.: 1978, Nature 275, p. 377.Google Scholar
Bohlin, R.C., and Holm, A.V.: 1980, “IDE Newsletter No. 10”, p. 37 Google Scholar
Code, A.D., Davis, J., Bless, R.C., and Hanbury Brown, R.: 1976, Astrophys. J. 203, p. 417.CrossRefGoogle Scholar
van Duinen, R.J., Aalders, J.W.G., Wesselius, P.R., Wildeman, K.J., Wu, C.-C, Luinge, W., and Snel, D. : 1975, Astron. Astrophys. 39, p. 159.Google Scholar
Fabbiano, G., Hartmann, L., Raymond, J., Steiner, J., Branduardi-Raymont, G., and Matilsky, T. : 1981, Astrophys. J. 243, p. 911.Google Scholar
Herter, T., Laçasse, M.G., Wesemael, F., and winget, D.E. : 1979, Astrophys. J. Suppl. 39, p. 513.Google Scholar
Johnson, H.L. : 1966, Ann. Rev. Astron. Astrophys. 4, p. 193 CrossRefGoogle Scholar
Krzeminski, W. : 1965, Astrophys. J. 142, p. 1051.Google Scholar
Mayo, S.K., Wickramasinghe, D.T., and Whelan, J.A.J. : 1980, Monthly Notices Roy. Astron. Soc. 193, p. 793.Google Scholar
Panek, R.J. : 1979, Astrophys. J. 234, p. 1016.Google Scholar
Sherrington, M.R., Lawson, P.A., King, A.R., and Jameson, R.F. : 1980, Monthly Notices Roy. Astron. Soc. 191, p. 185.Google Scholar
Smak, J. : 1976, Acta Astronomica 26, p. 277.Google Scholar
Wade, R.A. : 1979, Astron. J. 84, p. 562.CrossRefGoogle Scholar
Warner, B., and Nather, R.E. : 1971, Monthly Notices Roy. Astron. Soc. 152, p. 219.Google Scholar
Wu, C.-C, Faber, S.M., Gallagher, J.S., Peck, M., and Tinsley, S.M. : 1980, Astrophys. J. 237, p. 290.CrossRefGoogle Scholar
Wu, C.-C, Boggess, A., Holm, A.V., Schiffer, F.H. III, and Turnrose, B.E. : 1981, “IUE Ultraviolet Spectral Atlas, IUE Newsletter No. 14”, p. 2.Google Scholar