Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000coska..30..117p&link_type=abstract
Contributions of the Astronomical Observatory Skalnate Pleso, vol. 30, no. 2, p. 117-139.
Astronomy and Astrophysics
Astronomy
8
Binaries, Photometry, Orbital Period, Multiple Systems
Scientific paper
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.
Chochol Drahomir
Kreiner Jerzy M.
Parimucha Stefan
Pribulla Theodor
Tremko Josef
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