A Long-term Photometric Study of the Near-contact Binary RU Ursae Minoris

Details A Long-term Photometric Study of the Near-contact Binary RU Ursae Minoris A Long-term Photometric Study of the Near-contact Binary RU Ursae Minoris

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasp..120..720l&link_type=abstract

Publications of the Astronomical Society of the Pacific, Volume 120, issue 869, pp.720-729

Astronomy and Astrophysics

Astronomy

4

Stars

Scientific paper

New CCD photometric observations of the near-contact binary RU UMi were obtained from1999 December to 2000 April and later during 2003 March. All available times of minimum light, including our own measurements, have been examined and indicate that the orbital period of the system has experienced a continuous period decrease with a rate of M=-6.0×10 M yr. Historical light curves of RU UMi over a 32-yr interval display variably asymmetrical secondary minima. From analyses of velocity and light curves and of the light curves alone, the light variations are best represented by a variable cool spot that has consistently existed on the inner hemisphere of the secondary component. There is a weak indication that the hot star is no longer a main sequence one.

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