A New Transition Wolf–Rayet WN/C Star in the Milky Way
文献类型：期刊论文
| 作者 | Zhang,Wei4 ; Todt,Helge5; Wu,Hong4; Shi,Jianrong4; Hsia,Chih-Hao3; Wu,Yuzhong4; Wu,Chaojian4; Zhao,Yongheng4; Zhang,Tianmeng4; Hou,Yonghui1,2
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| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 902期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Wolf-Rayet stars Massive stars Stellar distance Galaxy stellar content |
| DOI | 10.3847/1538-4357/abb0e7 |
| 英文摘要 | Abstract We report the discovery of a new transition type Wolf–Rayet (W-R) WN/C star in the Galaxy. According to its coordinates (R.A., decl.)J2000? = 18 h 51 m 39 .? 7 , ?05°34′51.″1, and the distance (7.11 ? 1.22 + 1.56 kpc away from Earth) inferred from the second Gaia data release, it is found that W-R 121-16 is located in the Far 3 kpc Arm, and it is 3.75 kpc away from the Galactic Center. The optical spectra obtained by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope and the 2.16 m telescope, both located at the Xinglong Observatory in China, indicate that this is a W-R star of the transitional WN7o/WC subtype. A current stellar mass of about 7.1 ? 1.1 + 1.7 M☉, a mass-loss rate of M ? = 10 ? 4.97 ? 0.20 + 0.16 M ☉ yr ? 1 , a bolometric luminosity of log L/L☉ = 4.88 ? 0.15 + 0.17 , and a stellar temperature of T * = 47 ? 5 + 9 kK are derived by fitting the observed spectrum with a specific Potsdam W-R model. The magnitude in V-band varies between 13.95 and 14.14 mag, while no period is found. Based on the optical spectra, the time domain data, and the indices of the astrometric solution of the Gaia data, W-R 121-16 is likely a transitional WN/C single star rather than a WN+WC binary. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-902-1-ABB0E7 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/61924]  |
| 专题 | 光学部_LAMOST运行和发展中心 |
| 通讯作者 | Zhang,Wei |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 2.Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, People’s Republic of China 3.State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa, Macau, People’s Republic of China 4.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China xtwfn@bao.ac.cn 5.Institut für Physik und Astronomie, Universit?t Potsdam, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam, Germany |
| 推荐引用方式 GB/T 7714 | Zhang,Wei,Todt,Helge,Wu,Hong,et al. A New Transition Wolf–Rayet WN/C Star in the Milky Way[J]. The Astrophysical Journal,2020,902(1). |
| APA | Zhang,Wei.,Todt,Helge.,Wu,Hong.,Shi,Jianrong.,Hsia,Chih-Hao.,...&Hou,Yonghui.(2020).A New Transition Wolf–Rayet WN/C Star in the Milky Way.The Astrophysical Journal,902(1). |
| MLA | Zhang,Wei,et al."A New Transition Wolf–Rayet WN/C Star in the Milky Way".The Astrophysical Journal 902.1(2020). |
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