COMMUNICATIONS / MITTEILUNGEN
B. Szeidl ,
K. Oláh, L. Szabados, K. Barlai and L. Patkós
Photometry of the Peculiar Population II Cepheid RU Camelopardalis
(1966 - 1982)
No. 97 (Vol. 11, Part 4)
Budapest, 1992
Abstract
Photoelectric photometry of RU Cam was carried out at Konkoly Observatory on
1343 nights between 1966 and 1982. 1453 observations both in V and B and
30 observations in U have been published. Using all available data the period
and light curve changes of the star have been investigated. A slight
continuous period decrease took place between 1907 (P = 22.19 days) and 1965
(P = 22.07 days). After 1965 the period has become very unstable and fluctuated
between 17.4 and 26.6 days. It happened several times (probably at irregular
time intervals) that after a short-lived recovery phase the amplitude
decreased again and the light variation almost disappeared. The light curve
also showed that there were time intervals when the light varied irregularly
and the count of epoch numbers became very uncertain.
The photoelectric data obtained in the years 1965-1982 have been
Fourier-analysed. There was no indication for modulation effects. A number
of peaks appeared in the spectrum around f = 0.046 cycle/day suggesting that
stochastic or chaotic characters have become dominant in the star's pulsation.
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