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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
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) by applying the inverse-problem method (Djurasevic, 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: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 18 25 31.5 -12 41 24.2 RY Sct ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file observ.dat 52 509 UBVR data for RY Sct
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
Bytes Format Units Label Explanations
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
Acknowledgements: Gojko Djurasevic
(End) Patricia Bauer [CDS] 25-May-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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