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Revista mexicana de astronomía y astrofísica
Print version ISSN 0185-1101
Rev. mex. astron. astrofis vol.44 n.2 Ciudad de México Oct. 2008
A Photometric Study of the W UMa Type Eclipsing Binary V376 And
G. Djurasevic,1 F. Ekmekçi,2 B. Albayrak,2 S. O. Selam,2 and S. Erkapic1
1 Astronomical Observatory, Volgina 7, 11160 Belgrade, Serbia (gdjurasevic@aob.bg.ac.yu, serkapic@aob.bg.ac.yu).
2 Ankara University, Faculty of Science, Department of Astronomy and Space Sciences, 06100 Tandogan, Ankara, Turkey (fekmekci@science.ankara.edu.tr, albayrak@science.ankara.edu.tr, selim@astros1.science.ankara.edu.tr).
Received 2007 November 14
Accepted 2008 March 12
RESUMEN
Hemos analizado las nuevas curvas de luz UBV y BV para V376 And obtenidas en los observatorios de la Universidad de Ankara y de Rozhen y Bucarest, respectivamente, con el objeto de determinar los parámetros físicos del sistema y de estudiar su posible actividad. Las soluciones obtenidas por el método del problema inverso de Djurasevic, analizando simultáneamente las dos curvas de luz para la estación, describen al sistema V 376 And como una configuración en alto sobrecontacto ( ~ 36% 2004 y ~ 55% 2003) con una diferencia de temperaturas relativamente grande entre las componentes (ΔT = Th Tc ~ 880 840 K), la cual es característica de los sistemas tipo A en contacto. La asimetría de la curva de luz puede explicarse suponiendo una mancha fría (de tipo solar) en la componente menos masiva y más fría.
ABSTRACT
The new UBV photoelectric light curves of V376 And acquired at Ankara University Observatory in 2004 by the present authors and its BV light curves collected at Rozhen and Bucharest Observatories in 2003 (Dumitrescu et al. 2004) have been analysed and reanalysed, respectively, with the aim to derive physical parameters and to study the possible activity of the system. The solutions made by using Djurasevics inverseproblem method in the simultaneous analysis of both seasonal light curves describe the V376 And system as a high overcontact configuration ( ~ 36% 2004 and ~ 55% 2003) with relatively large temperature difference between components (ΔT = Th Tc ~ 880 840 K) which is characteristic for an Atype contact system. The light curve asymmetry can be explained by introducing the cool (solar type) spot region on the less massive, cooler, component.
Key Words: binaries: close binaries: eclipsing stars: fundamental parameters stars: individual (V376 And).
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