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Apsidal motion of U Oph

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The O-C diagram of U Oph, based on photoelectric and charge-coupled device data on the times of minimum light, was analysed. The traditional analysis method was used because of the clear sinusoidal shape of the O-C diagram (with a constant period). Thus, possible apsidal motion and a light time effect were considered. Moreover, taking into account the early visual and photographic data it was found to be consistent with our findings, within the error limits. Our results are in good agreement with those from previous analyses.

Keywords: Apsidal motion; Binary star; Eclipsing star; U Oph

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10556790701312616

Affiliations: Department of Physics, Section of Astrophysics, Astronomy and Mechanics, Athens University, Athens, Greece

Publication date: February 1, 2007

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