An active M star with X-ray double flares disguised as an ultra-luminous X-ray source
文献类型：期刊论文
| 作者 | Guo, Jin-Cheng1,2; Liu, Ji-Feng1 ; Wang, Song1; Wu, Yue1; Qin, Yu-Xiang3; Liu Jifeng; Wu Yue; Wang Song
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2016-02-01 |
| 卷号 | 16期号:2 |
| 关键词 | stars: flare X-ray: stars galaxies: individual (M101) |
| 英文摘要 | Here we present research on an ultra-luminous X-ray source (ULX) candidate 2XMM J140229.91+542118.8. The X-ray light curves of this ULX candidate in M101 exhibit features of a flare star. More importantly, the Chandra light curve displays unusual X-ray double flares, which is comprised of two close peaks. The X-ray (0.3-11.0 keV) flux of the first peak was derived from the two-temperature APEC model as similar to 1.1 +/- 0.1 x 10(-12) erg cm(-2) s(-1). The observed flux at its first peak increased by about two orders of magnitude in X-ray as compared to quiescence. The slope of the second fast decay phase is steeper than the slope of the first fast decay phase, indicating that the appearance of a second flare accelerated the cooling of the first flare in a way we do not understand yet. We also observed its optical counterpart using a 2.16 m telescope administered by National Astronomical Observatories, Chinese Academy of Sciences. By optical spectral fitting, it is confirmed to be a late type dMe2.5 star. According to the spectral type and apparent magnitude of its optical counterpart, we estimate the photometric distance to be similar to 133.4 +/- 14.2 pc. According to the X-ray spectral fitting, a possible explanation is provided. However, more similar close double flares are needed to confirm whether this accelerated cooling event is a unique coincidence or a common physical process during double flaring. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000369252500014 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5455]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia |
| 推荐引用方式 GB/T 7714 | Guo, Jin-Cheng,Liu, Ji-Feng,Wang, Song,et al. An active M star with X-ray double flares disguised as an ultra-luminous X-ray source[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(2). |
| APA | Guo, Jin-Cheng.,Liu, Ji-Feng.,Wang, Song.,Wu, Yue.,Qin, Yu-Xiang.,...&Wang Song.(2016).An active M star with X-ray double flares disguised as an ultra-luminous X-ray source.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(2). |
| MLA | Guo, Jin-Cheng,et al."An active M star with X-ray double flares disguised as an ultra-luminous X-ray source".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.2(2016). |
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来源：国家天文台
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