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HD 197617


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Period study of the contact system VW Cep
New photoelectric U,B and V observations of the eclipsing contact systemVW Cep were taken in 1998-2000 and 23 new minima times were determined.The (O-C) diagram constructed using photographic and photoelectricminima times can be explained by the light-time effect caused by thepresence of a third and fourth body in the system and the long-termperiod decrease interpreted by the mass transfer from the more to theless massive component or/and the magnetic-braking process. The suddenperiod increase detected in 1999 is probably a consequence of theepisodic mass transfer from the less to the more massive component.Enhanced surface activity causes short-term apparent variations of theorbital period. The differences of times of the subsequent primary andsecondary minima show two significant periodicities P_1 = 2.94 +/- 0.07years and P_2 = 2.36 +/- 0.05 years. The latter periodicity is probablythe beat period of the orbital and rotational period at the latitudes ofmost frequent occurrence of the spots.

On the Non-Variability of BD +74 877
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On the Nonvariability of BD +74 877
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Note on the star BD+74°877 near VW Cephei
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College Observatory Report.
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Untersuchungen an W Ursae Majoris Sternen. I. Mit 6 Textabbildungen
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Observation and Astrometry data

Constellation:Céphée
Right ascension:20h38m29.20s
Declination:+75°15'44.9"
Apparent magnitude:8.701
Distance:318.471 parsecs
Proper motion RA:6.5
Proper motion Dec:7.5
B-T magnitude:8.87
V-T magnitude:8.715

Catalogs and designations:
Proper Names
HD 1989HD 197617
TYCHO-2 2000TYC 4585-2132-1
USNO-A2.0USNO-A2 1650-02302577
HIPHIP 101863

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