Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005newa...10..653g&link_type=abstract
New Astronomy, Volume 10, Issue 8, p. 653-675.
Astronomy and Astrophysics
Astronomy
7
97.80, 95.10.G, 95.10.E, 97.10.N
Scientific paper
In the present study, the activity of the eclipsing binary AU Ser is examined by analyzing the photometric data covering the period from 1969 till 2003. The orbital-period changes and light-curve variations of the binary system are studied. 4 new times of minima are obtained from our data. A period study covering almost 60,000 cycles based on the visual, photoelectric and CCD times of minima confirms the light-time effect of the system with a period of 94.15 year. With the assumption of a coplanar orbit of the third-body we find a mass of m3 = 0.53M&sun;. Including our data a total of six light curves are formed from the observations published in the literature that are completely covered in B and V. The differences between the two maxima in each light curve appear to be cyclic over a time-scale over 30 years. Based on a spot model, the light curves are analyzed with the Wilson Devinney code. Using the spectroscopic mass ratio obtained by Hrivnak [Hrivnak, B.J., 1993. in: Leung, K.-C., Nha, I.S., Eds., New Frontiers in Binary Star Research, ASP Conference Series 38, p. 269] the masses and radii for the components are deduced as 0.895M&sun;, 0.635M&sun;, 1.10R&sun;, 0.94R&sun; for the primary and secondary, respectively.
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