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| 題名: | DISCOVERY of AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034-2201340 |
| 作者: | 周翊;Hu, Chin-Ping;Yang, Ting-Chang;Chou, Yi;Liu, L.;Qian, S.-B.;Hui, C. Y.;Kong, Albert K. H.;Lin, L. C. C.;Tam, P. H. T.;Li, K. L.;Ngeow, Chow-Choong;Chen, W. P.;Ip, Wing-Huen |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;binaries: close;binaries: eclipsing;BINARY STARS;BREMSSTRAHLUNG;Contact;DETECTION;EMISSION;ENERGY SPECTRA;GAMMA RADIATION;Mathematical models;Modulation;Orbitals;Photometry;POINT SOURCES;PULSARS;SKY;SPACE;stars: individual (2MASS J11201034-2201340);TELESCOPES;VISIBLE RADIATION;X RADIATION;X-RAY SOURCES;X-RAY SPECTRA;X-rays;X-rays: stars;XMM (spacecraft) |
| 日期: | 2016-06-01 |
| 上傳時間: | 2026-04-21 14:52:46 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States: The American Astronomical Society |
| 摘要: | 摘要： ABSTRACT 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 γ-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 γ-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 ) × 10 30 erg s−1, which is in the expected range of an X-ray emitting contact binary.
其他題名： AJ
其他題名： Astron. J
出版者： United States: The American Astronomical Society
出版日期： 2016-06-01
出處： The Astronomical Journal, 2016-06, Vol.151 (6), p.170-
資源來源： Institute of Physics Journals
版權： 2016. The American Astronomical Society. All rights reserved.
識別號： ISSN: 0004-6256
識別號： ISSN: 1538-3881
識別號： EISSN: 1538-3881
識別號： DOI: 10.3847/0004-6256/151/6/170 |
| 顯示於類別: | [天文研究所] 期刊論文
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