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- Title
Photometric studies for two contact binaries: V532 Monocerotis and GU Orionis.
- Authors
Yuangui YANG; Haifeng DAI; Huiyu YUAN; Xiliang ZHANG; Liyun ZHANG
- Abstract
We present photometry and spectroscopy data for V532Mon and GUOri, observed in 2011 and 2016. From the spectral observations, the spectral types are determined to be F5V for V532Mon and G0V for GUOri. With the 2015-version Wilson-Devinney program, the photometric solutions are simultaneously deduced from VR light curves (LCs). The intrinsic variability for V532Mon is found by comparing LCs in 2004 and 2011, while the asymmetric LCs for GUOri are modeled by a cool spot on the more massive component. The results imply that the two stars are A-type contact binaries. The mass ratios and fill-out factors are, respectively, q = 0.190(±0.006) and f = 43.7(±0.9)% for V532Mon and q = 0.455(±0.020) and f = 26.9(±1.3)% for GUOri. From the (O – C) curves, it is found that their orbital periods may be undergoing long-term variations. The rates of period change are dP/dt = -1.72(±0.05) × 10-7 dyr-1 for V532Mon and dP/dt = +1.45(±0.01) × 10-7 dyr-1 for GUOri. V532Mon with a decreasing period will evolve into a deep-contact binary, while GUOri with an increasing period may evolve into a broken-contact case.
- Subjects
STAR observations; STELLAR photometry; LIGHT curves of variable stars; STELLAR orbits; SPECTRUM analysis
- Publication
Publications of the Astronomical Society of Japan, 2017, Vol 69, Issue 4, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psx049