P. Zasche1,2 and R. Uhlar3
1 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, 04510 México, D. F., México. (zasche@sirrah.troja.mff.cuni.cz).
2 Charles University, Faculty of Mathematics and Physics, Astronomical Institute, CZ-180 00 Praha 8, V Holesovičkách 2, Czech Republic.
3 Private observatory, Pohorí 71, CZ-25401, Jílové u Prahy, Czech Republic. (rte@volny.cz).
Received 2009 January 6
Accepted 2009 July 30
RESUMEN
Se presenta por primera vez un análisis detallado de la curva de luz de la binaria eclisante TY Del. Se observó la curva de luz en B, V, R e I, y se derivaron nuevos tiempos para el mínimo. Se observó el mínimo secundario por primera vez. Es sistema es una binaria separada con componentes muy desiguales. La excentricidad aún es incierta, pero no se descarta un valor distinto de cero. Se discute la influencia de una posible tercera compañera, así como un posible movimiento apsidal. Si la hipótesis sobre el movimiento apsidal fuera confirmada, estaríamos ante el movimiento apsidal de más corto período entre las binarias eclipsantes conocidas.
ABSTRACT
A detailed light curve analysis of the eclipsing binary TY Del is presented for the first time. The B, V, R, and I light curves were observed and also new minima times have been derived. The secondary minimum has been observed for the first time. The system is probably a detached one with rather unequal components. Eccentricity of the system is still uncertain, but not ruled out. Also the influence of a possible third component is discussed together with a potential apsidal motion. If the hypothesis of apsidal motion is confirmed, it will be the shortest apsidal motion period among eclipsing binaries.
Key Words: binaries: close — binaries: eclipsing — stars: fundamental parameters — stars: individual (TY Del).
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