THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI
文献类型：期刊论文
| 作者 | Herczeg(沈雷歌),Gregory J.3; Dong,Subo3; Shappee,Benjamin J.4; Chen(陈 平),Ping3,5; Hillenbrand,Lynne A.6; Jose,Jessy3; Kochanek,Christopher S.7,8; Prieto,Jose L.9,10; Stanek,K. Z.7,8; Kaplan,Kyle15 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2016-11-03 |
| 卷号 | 831期号:2 |
| 关键词 | stars: formation stars: pre-main sequence stars: variables: general stars: winds, outflows |
| ISSN号 | 0004-637X |
| DOI | 10.3847/0004-637X/831/2/133 |
| 英文摘要 | ABSTRACT Outbursts on young stars are usually interpreted as accretion bursts caused by instabilities in the disk or the star–disk connection. However, some protostellar outbursts may not fit into this framework. In this paper, we analyze optical and near-infrared spectra and photometry to characterize the 2015 outburst of the probable young star ASASSN-15qi. The ～3.5 mag brightening in the V band was sudden, with an unresolved rise time of less than one day. The outburst decayed exponentially by 1 mag for 6?days and then gradually back to the pre-outburst level after 200 days. The outburst is dominated by emission from ～10,000 K gas. An explosive release of energy accelerated matter from the star in all directions, seen in a spectacular cool, spherical wind with a maximum velocity of 1000 km s?1. The wind and hot gas both disappeared as the outburst faded and the source returned to its quiescent F-star spectrum. Nebulosity near the star brightened with a delay of 10–20 days. Fluorescent excitation of H2 is detected in emission from vibrational levels as high as v?=?11, also with a possible time delay in flux increase. The mid-infrared spectral energy distribution does not indicate the presence of warm dust emission, though the optical photospheric absorption and CO overtone emission could be related to a gaseous disk. Archival photometry reveals a prior outburst in 1976. Although we speculate about possible causes for this outburst, none of the explanations are compelling. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-831-2-133 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://119.78.226.72/handle/331011/32167]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.23Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, 3037-5 Honjo, Kamogata, Asakuchi, Okayama, 719-0232, Japan 2.10Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 1A1, Canada 3.Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Haidian Qu, 100871 Beijing, People's Republic of China; gherczeg1@gmail.com 4.Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA 5.Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, China 6.Caltech, MC 105-24, 1200 E. California Boulevard, Pasadena, CA 91125, USA 7.Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA 8.Center for Cosmology and Astro-Particle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA 9.Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército 441, Santiago, Chile 10.Millennium Institute of Astrophysics, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Herczeg,Dong,Subo,Shappee,Benjamin J.,et al. THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI[J]. The Astrophysical Journal,2016,831(2). |
| APA | Herczeg.,Dong,Subo.,Shappee,Benjamin J..,Chen.,Hillenbrand,Lynne A..,...&Zheng,WeiKang.(2016).THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI.The Astrophysical Journal,831(2). |
| MLA | Herczeg,et al."THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI".The Astrophysical Journal 831.2(2016). |
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来源：上海天文台
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