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DISCOVERY OF AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034-2201340
Hu, Chin-Ping1,2; Yang, Ting-Chang2; Chou, Yi2; Liu L(刘亮)3; Qian SB(钱声帮)3; Hui, C. Y.4; Kong, Albert K. H.5; Lin, L. C. C.6; Tam, P. H. T.7; Li, K. L.8; Ngeow, Chow-Choong2; Chen, W. P.2; Ip, Wing-Huen2; Hu, CP
发表期刊ASTRONOMICAL JOURNAL
2016-06-01
卷号151期号:6
DOI10.3847/0004-6256/151/6/170
产权排序第3完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Individual (2mass J11201034-2201340) X-rays: Stars
摘要We report the detection of orbital modulation, a model solution, and the X-ray properties of a newly discovered contact binary, Two Micron All Sky Survey (2MASS) J11201034-2201340. We serendipitously found this X-ray point source outside the error ellipse when searching for possible X-ray counterparts of 7-ray millisecond pulsars among the unidentified objects detected by the Fermi Gamma-ray Space Telescope. The optical counterpart of the X-ray source (unrelated to the 7-ray source) was then identified using archival databases. The long-term Catalina Real-Time Transient Survey detected a precise signal with a period of P = 0.28876208 (56) days. A follow-up observation made by the Super Light Telescope of Lulin Observatory revealed the binary nature of the object. Utilizing archived photometric data of multi-band surveys, we construct the spectral energy distribution (SED), which is well fit by a K2V spectral template. The fitting result of the orbital profile using the Wilson Devinney code suggests that 2MASS J11201034-2201340 is a short-period A-type contact binary and the more massive component has a cool spot. The X-ray emission was first noted in observations made by Swift, and then further confirmed and characterized by an XMM-Newton observation. The X-ray spectrum can be described by a power law or thermal Bremsstrahlung. Unfortunately, we could not observe significant X-ray orbital modulation. Finally, according to the SED, this system is estimated to be 690 pc from Earth with a calculated X-ray intensity of (0.7 - 1.5) x 10(30) erg s(-1), which is in the expected range of an X-ray emitting contact binary.
项目资助者ESA Member States ; USA (NASA) ; U.S. National Science Foundation(AST-0909182) ; NASA ; National Science Foundation ; Ministry of Science and Technology (MOST) of Taiwan(NSC 101-2119-M008-007-MY3) ; ECS grant of Hong Kong Government(HKU 709713P) ; MOST(NSC 101-2119-M008-007-MY3, 104-2119-M-008-024, NSC 102-2112-M-008-020-MY3, 103-2628-M-007-003-MY3, NSC 101-2112-M-008-017-MY3, 104-2112-M-008-012-MY3, 103-2112-M-008-024-MY3) ; Science Foundation of Yunnan Province(2012HC011) ; Chinese Natural Science Foundation(11133007, 11325315) ; National Research Foundation of Korea(2014R1A1A2058590) ; One Hundred Talents Program of the Sun Yat-Sen University
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
WOS记录号WOS:000377990300037
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LIGHT CURVES ; STAR LIGHT ; VW-CEPHEI ; TIME-SERIES ; SKY SURVEY ; CATALOG
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9614
专题双星与变星研究组
通讯作者Hu, CP
作者单位1.Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong
2.Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan
3.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
4.Department of Astronomy and Space Science, Chungnam National University, Daejeon, Korea
5.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
6.Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan
7.Institute of Astronomy and Space Science, Sun Yat-Sen University, Guangzhou 510275, China
8.Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA
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Hu, Chin-Ping,Yang, Ting-Chang,Chou, Yi,et al. DISCOVERY OF AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034-2201340[J]. ASTRONOMICAL JOURNAL,2016,151(6).
APA Hu, Chin-Ping.,Yang, Ting-Chang.,Chou, Yi.,Liu L.,Qian SB.,...&Hu, CP.(2016).DISCOVERY OF AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034-2201340.ASTRONOMICAL JOURNAL,151(6).
MLA Hu, Chin-Ping,et al."DISCOVERY OF AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034-2201340".ASTRONOMICAL JOURNAL 151.6(2016).
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