COMMUNICATIONS / MITTEILUNGEN
Photoelectric UBV Photometry of Northern Cepheids, II
No. 76
Budapest, 1980
Abstract
New UBV photoelectric observational data on 42 northern Cepheids with periods
of 5-10 days are presented. The period changes and the variations in the
light curve of the observed Cepheids are investigated. No secular light curve
variation has been discovered.
The O-C diagrams of CV Mon and RS Ori show a period jump and a subsequent
rejump to the earlier value of the period. These two Cepheids as well as the
shorter period ones with a rejumping period are probably members of binary
systems. Another effect can be pointed out in AW Per and DD Cas which are
also members of binary systems: the apparent period changes due to the
orbital motion around the common centre of gravity can be seen. Both the
orbital period and the value of a x sin i can be determined for these latter
two stars. The combined effect (i.e.. the effect of the orbital motion and
the rejumping period) can be seen in the O-C diagram of the short period
Cepheid SU Cygni.
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