K-band spectroscopy of luminous young stellar objects
文献类型：期刊论文
| 作者 | Ishii, M; Nagata, T; Sato, S; Yao, YQ; Jiang, ZB ; Nakaya, H
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| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2001-06-01 |
| 卷号 | 121期号:6页码:3191-3206 |
| 关键词 | circumstellar matter dust, extinction stars : pre-main-sequence |
| ISSN号 | 0004-6256 |
| 英文摘要 | We present spectroscopy from 2.0 to 2.33 mum of 32 luminous young stellar objects (YSOs), which are presumed to be precursors of Herbig Ae/Be stars. From these stars, Br gamma, H(2), CO, He I, and Fe II were found in emission with detection rates of 97%, 34%, 22%, 9%, and 3%, respectively. We compare the spectral features with those of Herbig Ae/Be stars in the literature to investigate the spectral behavior of intermediate- to high-mass YSOs and to search for their relations to the spectral energy distributions (SEDs). H(2) emission is detected only in Class I SEDs with particularly large spectral indices. The detection of H(2) emission is related to the degree of the dispersal of circumstellar envelopes, where H(2) molecules are probably excited by shocks from outflows. On the other hand, Br gamma emission, which is generally thought to occur in stellar winds close to the stars, does not depend on the SEDs. This indicates that stellar wind from luminous YSOs does not change much from the embedded phase to the optically visible phase. CO emission is also independent of the SEDs, but the detection rate is much lower than that of Br gamma emission. Probably, more specific physical conditions regarding circumstellar disks and stellar radiation are necessary for CO emission to take place. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HERBIG AE/BE STARS ; NEAR-INFRARED SPECTROSCOPY ; IRAS POINT SOURCES ; IRON-CLAD NEBULA ; H-II REGIONS ; AE-BE STARS ; ACCRETION DISKS ; FORMING REGIONS ; H2O MASERS ; MICRON SPECTROSCOPY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000169387500024 |
| 公开日期 | 2013-01-31 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8185]  |
| 专题 | 紫金山天文台_分子云与恒星形成研究团组 |
| 作者单位 | 1.Nagoya Univ, Dept Astrophys, Chikusa Ku, Nagoya, Aichi 4648602, Japan 2.Chinese Acad Sci, Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA |
| 推荐引用方式 GB/T 7714 | Ishii, M,Nagata, T,Sato, S,et al. K-band spectroscopy of luminous young stellar objects[J]. ASTRONOMICAL JOURNAL,2001,121(6):3191-3206. |
| APA | Ishii, M,Nagata, T,Sato, S,Yao, YQ,Jiang, ZB,&Nakaya, H.(2001).K-band spectroscopy of luminous young stellar objects.ASTRONOMICAL JOURNAL,121(6),3191-3206. |
| MLA | Ishii, M,et al."K-band spectroscopy of luminous young stellar objects".ASTRONOMICAL JOURNAL 121.6(2001):3191-3206. |
入库方式： OAI收割
来源：紫金山天文台
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