J/A+A/374/638 RY Sct UBVR photometry (Djurasevic+, 2001)
A photometric study of the massive binary RY Sct
Djurasevic G., Zakirov M., Eshankulova M., Erkapic S.
<Astron. Astrophys. 374, 638 (2001)>
=2001A&A...374..638D 2001A&A...374..638D
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: stars: binaries: eclipsing, close - stars: early-type -
stars: individual: RY Sct
Abstract:
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
(Djurasevic, 1992Ap&SS.196..241D 1992Ap&SS.196..241D) by applying the inverse-problem
method (Djurasevic, 1992Ap&SS.197...17D 1992Ap&SS.197...17D) based on Marquardt's (1963,
J. Soc. Ind. Appl. Math. 11(2), 431) algorithm. The analysis shows
that RY Sct system is in an overcontact configuration (fover∼33%)
with q=m2/m1=mcool/mhot=3.3 and i∼84.3°, 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.
Objects:
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RA (2000) DE Designation(s)
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18 25 31.5 -12 41 24.2 RY Sct
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
observ.dat 52 509 UBVR data for RY Sct
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See also:
J/A+A/343/894 : RZ Tau UBVR photometry (Djurasevic+ 1999)
J/PAZh/25/764 : Multicolor photometry of RY Sct (Antokhina+, 1999)
Byte-by-byte Description of file: observ.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
15- 20 F6.4 --- Phase [0-1] Orbital phase
23- 28 F6.3 mag Umag ? U magnitude
31- 36 F6.3 mag Bmag ? B magnitude
39- 44 F6.3 mag Vmag ? V magnitude
47- 52 F6.3 mag Rmag ? R magnitude
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Acknowledgements: Gojko Djurasevic
(End) Patricia Bauer [CDS] 25-May-2001