How Do Stars Gain Their Mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions
文献类型：期刊论文
| 作者 | Herczeg,Gregory J.1; Johnstone,Doug2,3; Mairs,Steve2,3; Hatchell,Jennifer4; Lee,Jeong-Eun5; Bower,Geoffrey C.6; Chen,Huei-Ru Vivien7; Aikawa,Yuri8; Yoo,Hyunju5,9; Kang,Sung-Ju10 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-10-27 |
| 卷号 | 849期号:1 |
| 关键词 | stars: formation stars: protostars stars: variables: T Tauri, Herbig Ae/Be submillimeter: stars |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa8b62 |
| 英文摘要 | Abstract Most protostars have luminosities that are fainter than expected from steady accretion over the protostellar lifetime. The solution to this problem may lie in episodic mass accretion—prolonged periods of very low accretion punctuated by short bursts of rapid accretion. However, the timescale and amplitude for variability at the protostellar phase is almost entirely unconstrained. In A James Clerk Maxwell Telescope/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions, we are monitoring monthly with SCUBA-2 the submillimeter emission in eight fields within nearby ( < 500 pc) star-forming regions to measure the accretion variability of protostars. The total survey area of ～1.6 deg2 includes ～105 peaks with peaks brighter than 0.5 Jy/beam (43 associated with embedded protostars or disks) and 237 peaks of 0.125–0.5 Jy/beam (50 with embedded protostars or disks). Each field has enough bright peaks for flux calibration relative to other peaks in the same field, which improves upon the nominal flux calibration uncertainties of submillimeter observations to reach a precision of ～2%–3% rms, and also provides quantified confidence in any measured variability. The timescales and amplitudes of any submillimeter variation will then be converted into variations in accretion rate and subsequently used to infer the physical causes of the variability. This survey is the first dedicated survey for submillimeter variability and complements other transient surveys at optical and near-IR wavelengths, which are not sensitive to accretion variability of deeply embedded protostars. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-849-1-AA8B62 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22586]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.Kavli Institute for Astronomy and Astrophysics, Peking University, Yiheyuan 5, Haidian Qu, 100871 Beijing, China 2.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7, Canada 3.Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 5C2, Canada 4.Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK 5.School of Space Research, Kyung Hee University, 1732, Deogyeong-Daero, Giheung-gu Yongin-shi, Gyunggi-do 17104, Korea 6.Academia Sinica Institute of Astronomy and Astrophysics, 645 N. A’ohoku Place, Hilo, HI 96720, USA 7.Department of Physics and Institute of Astronomy, National Tsing Hua University, Taiwan 8.Department of Astronomy, University of Tokyo, Tokyo, Japan 9.Chungnam National University, Korea 10.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Korea |
| 推荐引用方式 GB/T 7714 | Herczeg,Gregory J.,Johnstone,Doug,Mairs,Steve,et al. How Do Stars Gain Their Mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions[J]. The Astrophysical Journal,2017,849(1). |
| APA | Herczeg,Gregory J..,Johnstone,Doug.,Mairs,Steve.,Hatchell,Jennifer.,Lee,Jeong-Eun.,...&Wang,Yiren.(2017).How Do Stars Gain Their Mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions.The Astrophysical Journal,849(1). |
| MLA | Herczeg,Gregory J.,et al."How Do Stars Gain Their Mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions".The Astrophysical Journal 849.1(2017). |
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