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BVRI Light Curves and Period Analysis of the Beta Lyrae System XX Leonis

Published online by Cambridge University Press:  09 August 2007

P. Zasche ,
P. Svoboda  and
M. Wolf
P. Zasche
Affiliation:
Astronomical Institute, Faculty of Mathematics and Physic, Charles University, V Holešovičkách 2, CZ - 180 00 Praha 8, Czech Republic, email: [email protected]
P. Svoboda
Affiliation:
Private observatory, Výpustky 5, CZ - 614 00 Brno, Czech Republic
M. Wolf
Affiliation:
Astronomical Institute, Faculty of Mathematics and Physic, Charles University, V Holešovičkách 2, CZ - 180 00 Praha 8, Czech Republic, email: [email protected]
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Abstract

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The contact eclipsing binary system XX Leonis (p = 0.97 days, Sp A9) has been analysed using the PHOEBE programme, based on the Wilson–Devinney code. The BVRI light curves were obtained during spring 2006 using the 20-cm telescope and ST-7 CCD detector. The effective temperature of the primary component determined from the photometric analysis is T = (7342 ± 14) K, the inclination of the orbit is i = (84.83 ± 0.29)° and the photometric mass ratio q = (0.40 ± 0.01). The third-body hypothesis was also suggested; based on a period analysis using 57 minimum times this gave a period for the third body of p3 = (59.66 ± 0.05) yr, an amplitude of A = (0.036 ± 0.028) day and zero eccentricity, which yields as a minimum mass M3,min = (0.91 ± 0.01) M⊙.

Keywords

stars: binariesbinaries: closebinaries: eclipsingstars: fundamental parametersstars: individual (XX Leo)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 551 - 554
Copyright
Copyright © International Astronomical Union 2007

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