The history of U Coronae Borealis - A sequel

Details The history of U Coronae Borealis - A sequel The history of U Coronae Borealis - A sequel

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jrasc..75..124b&link_type=abstract

Journal of the Royal Astronomical Society of Canada, vol. 75, June 1981, p. 124-131. Research supported by the Natural Sciences

Astronomy and Astrophysics

Astronomy

8

Corona Borealis Constellation, Eclipsing Binary Stars, Light Curve, Stellar Structure, Astronomical Photography, Electrophotometers, Periodic Variations, Visual Observation

Scientific paper

Photoelectric observations of the binary star U Coronae Borealis made since 1968 are presented and discussed in relation to the nature of the observed period variations. Light curves and epochs of primary minima were calculated based on observations in the B spectral band obtained with a single-channel photoelectric photometer. The O-C diagram of U CrB representing the residuals from a linear ephemeris formula are found to be represented by a smooth sinusoidal curve of period close to 30 years (3200 times the orbital period). Possible explanations of the observed period variation are considered, and it is concluded that they can best be explained by a light-time orbit of the eclipsing pair about a distant companion, with mass transfer from the secondary accounting for only a small perturbation of the light curve.

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