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AAVSO Photoelectric Photometry of RU Cam
We report AAVSO photoelectric photometry of RU Cam from 1987 to 1997.The average amplitude is 0.2, with some fluctuations. The period is22.20 days, as it has been for many decades.
| Photometry of the Peculiar Population II Cepheid RU Camelopardalis (1966 - 1982)
Photoelectric photometry of RU Cam was carried out at KonkolyObservatory on 1343 nights between 1966 and 1982. 1453 observations bothin V and B and 30 observations in U have been published. Using allavailable data the period and light curve changes of the star have beeninvestigated. A slight continuous period decrease took place between1907 (P = 22.19 days) and 1965 (P = 22.07 days). After 1965 the periodhas become very unstable and fluctuated between 17.4 and 26.6 days. Ithappened several times (probably at irregular time intervals) that aftera short-lived recovery phase the amplitude decreased again and the lightvariation almost disappeared. The light curve also showed that therewere time intervals when the light varied irregularly and the count ofepoch numbers became very uncertain. The photoelectric data obtained inthe years 1965-1982 have been Fourier-analysed. There was no indicationfor modulation effects. A number of peaks appeared in the spectrumaround f = 0.046 cycle/day suggesting that stochastic or chaoticcharacters have become dominant in the star's pulsation.
| Observational studies of Cepheids. II - BVRI photometry of 112 Cepheids
Over 4000 differentially determined photoelectric BVRI observations andthe resulting light curves are presented for 112 Cepheids accessiblefrom Northern Hemisphere observatories. The internal precision of thesedata is better than + or - 0.01 mag, and the accuracy of transformationto the Johnson BVRI system is nearly as good.
| RU Cam: Early Phases of Recovery
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