CAOSP abstracts, Volume: 30, No.: 2, year: 2000
- Author(s): PRIBULLA, T.; CHOCHOL, D.; TREMKO, J.; PARIMUCHA, S.; VANKO, M.;
KREINER, J.M.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 30, no. 2, p. 117-139.
- Date: 10/2000
- Title: Period study of the contact system VW Cep
- Keyword(s): BINARIES, PHOTOMETRY, ORBITAL PERIOD, MULTIPLE SYSTEMS
- Pages: 117 -- 139
Abstract:
New photoelectric U,B and V observations of the eclipsing contact system
VW Cep were taken in 1998-2000 and 23 new minima times were determined. The
(O-C) diagram constructed using photographic and photoelectric minima times can
be explained by the light-time effect caused by the presence of a third and
fourth body in the system and the long-term period decrease interpreted by the
mass transfer from the more to the less massive component or/and the
magnetic-braking process. The sudden period increase detected in 1999 is
probably a consequence of the episodic mass transfer from the less to the more
massive component. Enhanced surface activity causes short-term apparent
variations of the orbital period. The differences of times of the subsequent
primary and secondary minima show two significant periodicities P_1 = 2.94
+/- 0.07 years and P_2 = 2.36 +/- 0.05 years. The latter periodicity is
probably the beat period of the orbital and rotational period at the latitudes
of most frequent occurrence of the spots.
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