COMMUNICATIONS / MITTEILUNGEN
Photoelectric UBV Photometry of Northern Cepheids, III
No. 77
Budapest, 1981
Abstract
New UBV photoelectric observational data on 25 northern Cepheids with periods
longer than 10 days are presented. The period changes and the variations in
the light curve of the observed Cepheids are investigated.
Almost half of the programme stars show continuous period change
(parabolic O-C curve). Among the Cepheids in binary systems YZ Aur, SV Per
and perhaps AN Aur show a period jump and a subsequent rejump to the earlier
value of the period. The apparent period changes due to orbital motion around
the common centre of gravity can be seen in RW Cam, X Cyg, SZ Cyg and T Mon.
The orbital period of RW Cam is about 6600 Days. The only new case of secular
light curve variation is observed in AN Aur.
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