Further period changes in U Cephei

Details Further period changes in U Cephei Further period changes in U Cephei

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..464o&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Aug.-Sept. 1981, p. 464-469. Research supported by Stephen F. Austi

Astronomy and Astrophysics

Astronomy

23

Cepheid Variables, Eclipsing Binary Stars, Stellar Spectrophotometry, B Stars, Electrophotometry, Ephemerides, Mass Transfer, Orbital Mechanics, Stellar Envelopes, Stellar Mass, Stellar Models, Stellar Motions, Stellar Rotation, Tides

Scientific paper

The undisturbed eclipse timings of U Cep obtained over the last decade are discussed. It is shown that abrupt period changes of both signs were separated by intervals of essentially constant period. The apparent lack of a gradually changing period rules out a steadily-acting tidal torque in the Biermann-Hall (1973) theory. The most recent period decrease (April 1979) occurred rapidly (less than 40 days) and left no visible trace of circumstellar matter. Possible mechanisms of period changes of both signs are examined.

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