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Long-Term Brightness Changes of Two CVs

Published online by Cambridge University Press:  12 April 2016

D. A. Sokolov ,
S. Yu. Shugarov  and
E. P. Pavlenko
D. A. Sokolov
Affiliation:
Sternberg Astronomical Institute, Universitetsky avenue, 13 119899, Moscow V-234, Russia, e-mail:[email protected]
S. Yu. Shugarov
Affiliation:
Sternberg Astronomical Institute, Universitetsky avenue, 13 119899, Moscow V-234, Russia, e-mail:[email protected]
E. P. Pavlenko
Affiliation:
Crimean Astrophysical Observatory, Crimea 334413, Ukraine

Abstract

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The long-term light curves of the AM Her type binary BY Cam and the nova-like variable PG 2133+115 are presented. The BVR observations were carried out at a 0.5 m telescope equipped with a high sensitive TV tube superisocon (Abramenko et al. 1978), the UBV photoelectric data were obtained at 0.6 and 1.25 m telescopes and the photographic estimates were made from the negatives obtained at the 0.4 m astrograph in Crimea.

Both stars show high and low brightness states. They show similar behaviour in some respects: the amplitude between high and low states was about two magnitudes in B, but the duration of a low state was approximately two months for BY Cam and 1… 2 years for PG 2133+115.

Type
Polar Systems
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 219 - 220
Copyright
Copyright © Kluwer 1996

References

Abramenko, A.M., Prokof’eva, V.V., Bondar, N.I. et al., 1988, Bull. of the Crimean Astroph. Obs., 78, 189 Google Scholar
Green, R.F., Ferguson, D., Liebert, J., 1982, PASP, 94, 560 CrossRefGoogle Scholar
Misselt, K.A., Shatter, A.W., 1995, AJ, 109, 1757 Google Scholar