Observations visuelles de VW Cephei en 1975.

Details Observations visuelles de VW Cephei en 1975. Observations visuelles de VW Cephei en 1975.

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980geoce...5.....r&link_type=abstract

GEOS Circular on Eclipsing Binaries, No. EB 5, 5 p. (1980)

Physics

Eclipsing Binaries:Light Curves, Eclipsing Binaries:Periods, Periods

Scientific paper

Over 800 visual estimates of the bright eclipsing contact-binary VW Cep are discussed. After a rapid synthesis of previous results concerning this star, a mean light-curve based on 3 months of observations is presented, and 37 primary and secondary minima have benn determined. They show a shift from the values predicted by the ephemeris, indicating an increase in the period and a drift of the secondary minimum from phase 0.5. It is therefore established once more that visual observations allow, when processed with care, a discrimination between primary and secondary minima for a star of limited amplitude. In a like manner, it is also shown that it is quite possible to deetermine with precision a minimum by using such estimates, in so far as the dissymmetry of the light-curve is taken into account, and on the condition of using to this purpose measures that are included within the same phase interval.

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