Close binary and other variable stars in the solar-age Galactic open cluster M 67
Makaleler > Tam Makale · 2009
Yazarlar: Kadri YAKUT, W ZİMA, Belinda KALOMENİ YAKUT, H. Van Winckel, C WAELKENS, P. De Cat, E BAUWENS, M VUCKOVİC, S SAESEN, L. Le Guillou, M PARMAKSIZOĞLU, K ULUÇ, I KHAMİTOV, G RASKİN, C AERTS
Astronomy & Astrophysics, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2009, cilt 503, ss 165-176
DOI: 10.1051/0004-6361/200911918
Özet
We present multi-colour time-series CCD photometry of the solar-age galactic open cluster M 67 (NGC 2682). About 3600 frames spread over 28 nights were obtained with the 1.5 m Russian-Turkish and 1.2 m Mercator telescopes. High-precision observations of the close binary stars AH Cnc, EV Cnc, ES Cnc, the δ Scuti type systems EX Cnc and EW Cnc, and some long-period variables belonging to M 67 are presented. Three full multi-colour light curves of the overcontact binary AH Cnc were obtained during three observing seasons. Likewise we gathered three light curves of EV Cnc, an EB-type binary, and two light curves of ES Cnc, a blue straggler binary. Parts of the light change of long-term variables S1024, S1040, S1045, S1063, S1242, and S1264 are obtained. Period variation analysis of AH Cnc, EV Cnc, and ES Cnc were done using all times of mid-eclipse available in the literature and those obtained in this study. In addition, we analyzed multi-colour light curves of the close binaries and also determined new frequencies for the δ Scuti systems. The physical parameters of the close binary stars were determined with simultaneous solutions of multi-colour light and radial velocity curves. Finally we determined the distance of M 67 as 857(33) pc via binary star parameters, which is consistent with an independent method from earlier studies.