Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110.1428p&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 754, pp. 1428-1430.
Astronomy and Astrophysics
Astronomy
15
Stars: Variables: Cepheids, Stars: Agb And Post-Agb, Stars: Evolution, Stars: Individual: Constellation Name: Ru Camelopardalis, Stars: Peculiar, Stars: Population Ii
Scientific paper
We have studied the period change in the peculiar Population II Cepheid RU Cam, which abruptly decreased in amplitude in 1965-1966. The O-C diagram prior to 1965-1966 can best be explained as the superposition of small, random, cycle-to-cycle changes in period, plus a constant linear decrease whose timescale (31,000 yr) is consistent with evolutionary predictions. The O-C diagram after 1965-1966 can best be explained as the superposition of much larger random, cycle-to-cycle changes (which mask the evolutionary changes), plus wavelike changes in O-C on a timescale of 10-20 periods. These-and the variations in the amplitude of the star that occur on the same timescale-may be due to multiperiodicity.
Hale Jonathan
Percy John R.
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