Photometric solution and period analysis of the contact binary system AH Cnc

Abstract

Photometric observations of AH Cnc, a W UMa-type system in the open cluster M67, were carried out by using the 50BiN telescope. About 100 h of time-series Band V -band data were taken, based on which eight new times of light minima were determined. By applying the Wilson-Devinney method, the light curves were modeled and a revised photometric solution of the binary system was derived. We confirmed that AH Cnc is a deep contact (f = 51%), low mass-ratio (q = 0.156) system. Adopting the distance modulus derived from study of the host cluster, we have re-calculated the physical parameters of the binary system, namely the masses and radii. The masses and radii of the two components were estimated to be respectively 1.188(±0.061) M ⊙ , 1.332(±0.063) R ⊙ for the primary component and 0.185(±0.032) M ⊙ , 0.592(±0.051) R ⊙ for the secondary. By adding the newly derived minimum timings to all the available data, the period variations of AH Cnc were studied. This shows that the orbital period of the binary is continuously increasing at a rate of dp/dt = 4.29 × 10 −10 d yr −1 . In addition to the long-term period increase, a cyclic variation with a period of 35.26 yr was determined, which could be attributed to an unresolved tertiary component of the system.

UVIT Open Cluster Study. II. Detection of Extremely Low Mass White Dwarfs and Post–Mass Transfer Binaries in M67

“…Yakut et al (2009) calculated the MT rate of 9.4 × 10 −8 M yr −1 for the binary with a mass ratio of 0.17, P = 0.3604360 ± 0.0000001 days. Peng et al (2016) estimated the masses and radii of the components of the contact binary as 1.188±0.061 M , 1.332±0.063 R and 0.185±0.032 M , 0.592±0.051 R respectively through period analysis.…”

New photometric studies for two deep, low-mass ratio overcontact binaries: Y Sex and V1363 Ori

“…For Y Sex and V1363 Ori, there evidently exist quasicyclic variations from their (O − C) curves of Figure 3. This case occurs in other DLMR overcontact binaries Yang & Qian (2015), such as CK Boo (Yang 2012), V345 Gem (Yang 2009) and AH Cnc (Peng et al 2016).…”

The Simultaneous Three-channel Multicolor CCD Photometric System of the 1.2 m Telescope at Jilin Astronomical Observatory*

“…M67 (also known as Messier 67 or NGC 2682, hereinafter referred to as M67) is selected as the observation object, which is an open star cluster located in the constellation of Cancer, with about 500 members(Zhang et al 2005;Pribulla et al 2008;Peng et al 2016;Canton et al 2021). The star field is not dense and the brightness is concentrated in 10-11 mag, which is an ideal photometric calibration area.…”