Eclipsing binaries from the cstar project at Dome A, Antarctica

Yang, Ming and Zhang, Hui and Wang, Songhu and Zhou, Ji-Lin and Zhou, Xu and Wang, Lingzhi and Wang, Lifan and Wittenmyer, R. A. and Liu, Hui-Gen and Meng, Zeyang and Ashley, M. C. B. and Storey, J. W. V. and Bayliss, D. and Tinney, Chris and Wang, Ying and Wu, Donghong and Liang, Ensi and Yu, Zhouyi and Fan, Zhou and Feng, Long-Long and Gong, Xuefei and Lawrence, J. S. and Liu, Qiang and Luong-Van, D. M. and Ma, Jun and Wu, Zhenyu and Yan, Jun and Yang, Huigen and Yang, Ji and Yuan, Xiangyan and Zhang, Tianmeng and Zhu, Zhenxi and Zou, Hu (2015) Eclipsing binaries from the cstar project at Dome A, Antarctica. Astrophysical Journal, Supplement Series, 217 (2). ISSN 0067-0049

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Abstract

The Chinese Small Telescope ARray (CSTAR) has observed an area around the Celestial South Pole at Dome A since 2008. About 20,000 light curves in the i band were obtained during the observation season lasting from 2008 March to July. The photometric precision achieves about 4 mmag at i = 7.5 and 20 mmag at i = 12 within a 30 s exposure time. These light curves are analyzed using Lomb-Scargle, Phase Dispersion Minimization, and Box Least Squares methods to search for periodic signals. False positives may appear as a variable signature caused by contaminating stars and the observation mode of CSTAR. Therefore, the period and position of each variable candidate are checked to eliminate false positives. Eclipsing binaries are removed by visual inspection, frequency spectrum analysis, and a locally linear embedding technique. We identify 53 eclipsing binaries in the field of view of CSTAR,containing 24 detached binaries, 8 semi-detached binaries, 18 contact binaries, and 3 ellipsoidal variables. To derive the parameters of these binaries, we use the Eclipsing Binaries via Artificial Intelligence method. The primary and secondary eclipse timing variations (ETVs) for semi-detached and contact systems are analyzed. Correlated primary and secondary ETVs confirmed by false alarm tests may indicate an unseen perturbing companion. Through ETV analysis, we identify two triple systems (CSTAR J084612.64-883342.9 and CSTAR J220502.55-895206.7). The orbital parameters of the third body in CSTAR J220502.55-895206.7 are derived using a simple dynamical model.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: No Faculty
Date Deposited: 17 May 2017 01:44
Last Modified: 02 Nov 2017 04:36
Uncontrolled Keywords: eclipsing binaries; data analysis; methods; site testing; stars; statistics; photometric techniques
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0067-0049/217/2/28
URI: http://eprints.usq.edu.au/id/eprint/31754

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