THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI
文献类型：期刊论文
| 作者 | Herczeg, Gregory J.12; Dong, Subo12; Shappee, Benjamin J.11; Chen, Ping10,12; Hillenbrand, Lynne A.9; Jose, Jessy12; Kochanek, Christopher S.7,8; Prieto, Jose L.5,6; Stanek, K. Z.7,8; Kaplan, Kyle4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-11-20 |
| 卷号 | 831期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Stars: Formation Stars: Pre-main Sequence Stars: Variables: General Stars: Winds, Outflows Supporting Material: Machine-readable Table |
| DOI | 10.3847/0004-637X/831/2/133 |
| 英文摘要 | 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 similar to 3.5mag brightening in the V band was sudden, with an unresolved rise time of less than one day. The outburst decayed exponentially by 1mag for 6. days and then gradually back to the pre-outburst level after 200 days. The outburst is dominated by emission from similar to 10,000K 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 H-2 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. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000387792500019 |
| 源URL | [http://119.78.226.72/handle/331011/32697]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Herczeg, Gregory J. |
| 作者单位 | 1.Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane,Peyton Hall, Princeton, NJ 08544 USA 2.Natl Astron Observ Japan, Okayama Astrophys Observ, 3037-5 Honjo, Asakuchi, Okayama 7190232, Japan 3.Hiroshima Univ, Hiroshima Astrophys Sci Ctr, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 7398526, Japan 4.Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA 5.Millennium Inst Astrophys, Santiago, Chile 6.Univ Diego Portales, Fac Ingn, Nucleo Astron, Av Ejercito 441, Santiago, Chile 7.Ohio State Univ, Ctr Cosmol & Astroparticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA 8.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA 9.CALTECH, MC 105-24,1200 E Calif Blvd, Pasadena, CA 91125 USA 10.Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Herczeg, Gregory J.,Dong, Subo,Shappee, Benjamin J.,et al. THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI[J]. ASTROPHYSICAL JOURNAL,2016,831(2). |
| APA | Herczeg, Gregory J..,Dong, Subo.,Shappee, Benjamin J..,Chen, Ping.,Hillenbrand, Lynne A..,...&Zheng, WeiKang.(2016).THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI.ASTROPHYSICAL JOURNAL,831(2). |
| MLA | Herczeg, Gregory J.,et al."THE ERUPTION OF THE CANDIDATE YOUNG STAR ASASSN-15QI".ASTROPHYSICAL JOURNAL 831.2(2016). |
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来源：上海天文台
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