Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..638d&link_type=abstract
Astronomy and Astrophysics, v.374, p.638-645 (2001)
Astronomy and Astrophysics
Astrophysics
7
Stars: Binaries: Eclipsing, Close, Stars: Early-Type, Stars: Individual: Ry Sct
Scientific paper
The present study deals with the problem of the estimation of the orbital and physical parameters for the EB-type eclipsing binary RY Sct, based on the interpretation of new photometric U B V R observations. The light curves obtained at the Maidanak Observatory during 1979-94 show a slight asymmetry around the secondary minima and a small difference in the height of the successive maxima. The light curves are analysed in the framework of the Roche computer model (Djurašević \cite{djurasevica}) by applying the inverse-problem method (Djurašević \cite{djurasevicb}) based on Marquardt's (\cite{marquardt}) algorithm. The analysis shows that RY Sct system is in an overcontact configuration (fover ~ 33%) with q=m2/m1=3.3 and i ~ 84fdg 3, generating total-annular eclipses. The basic parameters of the system and of the active region are estimated for all individual U, B, V and R light curves. Our results suggested a mass exchange between the components and mass loss through the outer Lagrangian point L3. This could be taken as a possible mechanism in the formation of the circumstellar envelope of toroidal form lying in the orbital plane of the system. The data are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.70.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/374/638
Djurasevic Gojko
Erkapic S.
Eshankulova M.
Zakirov Mamnun M.
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