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DOI: 10.1051/aas:2000133
Astron. Astrophys. Suppl. Ser. 142, 31-34
A period study of the W UMa type contact binary V 781 Tauri
Qingyao Liu - Yulan Yang
Send offprint request: Qingyao Liu
Yunnan Observatory, Chinese Academy of Sciences,
Kunming, Yunnan, China
United Laboratory of Optical Astronomy, Chinese Academy of Sciences, China
National Astronomical Observatories, Chinese Academy of Sciences, China
e-mail: bily@public.km.yn.cn
Received May 25; accepted November 2, 1999
Abstract:
New times of minimum light determined from
the observations of the W UMa type contact binary
V 781 Tau are presented. According to these times of minima
and those collected from the references, the change in
the orbital period of the system is analyzed. The
result reveals that the orbital period of V 781 Tau
decreased continually from 1949 to 1998 and the change
rate in the period is
.
The
decrease in the period of the binary is explained by a model of
the contracting secondary component of the system.
The shrinking velocity of
6.77 10-5 cm s-1 as
responsible for the change in the orbital period
of the system is obtained, which is in agreement with
the results shown in the study of the thermal
relaxation oscillation of contact binaries by [Wang
(1994)].
Copyright The European Southern Observatory (ESO)
.
The
decrease in the period of the binary is explained by a model of
the contracting secondary component of the system.
The shrinking velocity of
6.77 10-5 cm s-1 as
responsible for the change in the orbital period
of the system is obtained, which is in agreement with
the results shown in the study of the thermal
relaxation oscillation of contact binaries by [Wang
(1994)].
Key words: stars: binaries: close -- stars: binaries: general -- stars: kinematics
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