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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