CCD photometric study of the contact binary TX Cnc in the young open cluster NGC 2632

• Main Authors: Liu L., Qian S.-B., Boonrucksar S., Zhu L.-Y., He J.-J., Yuan J.-Z.
• Format: Article
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-34547199045&partnerID=40&md5=5c5937cd3222b5738c3f7fb8818575d0; http://cmuir.cmu.ac.th/handle/6653943832/5224
• Institution: Chiang Mai University

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 superimposed on a long-term increase (dP/dt = +3.97 × 10-8 d yr-1), and weak evidence suggests that it includes a small-amplitude period oscillation (A3 = 0. d0028; T3 = 26.6 yr). 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% (±0.9%). The absolute parameters of the system were calculated: M1 = 1.319 ±0.007M⊙, M2 = 0.600 ± 0.01 M⊙; R1 = 1.28 ± 0.19R⊙, R2 = 0.91 ± 0.13R⊙. TX Cnc may be on the TRO-controlled stage of the evolutionary scheme proposed by Qian (2001a, b, 2003a), and may contain an invisible tertiary component (m 3 ≈ 0.097M⊙). 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 shortlife time of a young open cluster via AML. © 2007. Astronomical Society of Japan.