Photometric study of the over-contact binary star GSC 3822-1056

Details Photometric study of the over-contact binary star GSC 3822-1056 Photometric study of the over-contact binary star GSC 3822-1056

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..637c&link_type=abstract

Astronomy and Astrophysics, v.403, p.637-643 (2003)

Astronomy and Astrophysics

Astrophysics

Techniques: Photometric, Stars: Binaries: Eclipsing, Stars: Binaries: Close, Stars: Individual: Gsc 3822-1056

Scientific paper

Here we present the first Johnson-Cousins VRC light curves of the over-contact binary star GSC 3822-1056. A period study and the light curve solution are also given. An extremely high rate of period increase (+11.6 s/century) was found. The origin of this period change can be: (i) partly covered light-time effect due to the orbital motion around the mass center of a possible third body; (ii) mass transfer between the components.
The light curve was solved using the 1998 Wilson-Devinney Code. We examined the light curve with and without third light. Both solutions yielded a contact configuration with high temperature difference between the components. Despite the high degree of the contact (f=0.57), the temperature difference between the components Delta T=Tprimary-Tsecondary=1045 K.
The high mass ratio of the system and its other unusual properties suggest that GSC 3822-1056 may be a recently formed contact binary.
Observations were made by the 80 cm ``IAC80'' telescope at Observatorio del Teide in Tenerife, Spain, operated by Instituto de Astrofisica de Canarias.
Tables 2a-c are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/403/637

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