CCD Photometric Study of the Contact Binary TX Cnc in the Young Open Cluster NGC 2632

Liu Liang; Qian Shengbang; BOONRUCKSAR Soonthornthum; Zhu Liying; He Jiajia; J. -Z. Yuan

doi:10.1093/pasj/59.3.607

paper

CCD Photometric Study of the Contact Binary TX Cnc in the Young Open Cluster NGC 2632

arXiv:1103.2020 · doi:10.1093/pasj/59.3.607

Abstract

TX Cnc is a member of the young open cluster NGC 2632. In the present paper, four CCD epochs of light minimum and a complete V light curve of TX Cnc are presented. A period investigation based on all available photoelectric or CCD data showed that it is found to be superimposed on a long-term increase ( $d P / d t = + 3.97 \times 1 0^{- 8}$ \,days/year), and a weak evidence suggests that it includes a small-amplitude period oscillation ( $A_{3} = 0 .^{d} 0028$ ; $T_{3} = 26.6 y e a r s$ ). The light curves in the V band obtained in 2004 were analyzed with the 2003 version of the W-D code. It was shown that TX Cnc is an overcontact binary system with a degree of contact factor $f = 24.8$ . The absolute parameters of the system were calculated: $M_{1} = 1.319 \pm 0.007 M_{⊙}$ , $M_{2} = 0.600 \pm 0.01 M_{⊙}$ ; $R_{1} = 1.28 \pm 0.19 R_{⊙}$ , $R_{2} = 0.91 \pm 0.13 R_{⊙}$ . TX Cnc may be on the TRO-controlled stage of the evolutionary scheme proposed by Qian (2001a, b; 2003a), and may contains an invisible tertiary component ( $m_{3} \approx 0.097 M_{⊙}$ ). If this is true, the tertiary component has played an important role in the formation and evolution of TX Cnc by removing angular momentum from the central system(Pribulla & Rucinski, 2006). In this way the contact binary configuration can be formed in the short life time of a young open cluster via AML.

CCD Photometric Study of the Contact Binary TX Cnc in the Young Open Cluster NGC 2632

Abstract

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