Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters
文献类型：期刊论文
| 作者 | Li, Juan1,2; Myers, Philip C.3; Kirk, Helen4,5; Gutermuth, Robert A.6; Dunham, Michael M.3,7; Pokhrel, Riwaj3,6 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-02-01 |
| 卷号 | 871期号:2页码:18 |
| ISSN号 | 0004-637X |
| 关键词 | infrared: stars stars: formation stars: low-mass stars: pre-main sequence stars: protostars |
| DOI | 10.3847/1538-4357/aaf652 |
| 通讯作者 | Li, Juan(lijuan@shao.ac.cn) |
| 英文摘要 | We analyze high-quality stellar catalogs for 24 young and nearby (within 1 kpc) embedded clusters and present a catalog of 32 groups which have a high concentration of protostars. The median effective radius of these groups is 0.17 pc. The median protostellar and pre-main-sequence star surface densities are 46 M-circle dot pc(-2) and 11 M-circle dot pc(-2), respectively. We estimate the age of these groups using a model of constant birthrate and random accretion stopping and find a median value of 0.25 Myr. Some groups in Aquila, Serpens, Corona Australia, and Ophichus L1688 show high protostellar surface density and high molecular gas surface density, and seem to be undergoing vigorous star formation. These groups provide an excellent opportunity to study the initial conditions of clustered star formation. Comparisons of protostellar and pre-main-sequence stellar surface densities reveal continuous low-mass star formation of these groups over several Myr in some clouds. For groups with typical protostellar separations of less than 0.4 pc, we find that these separations agree well with the thermal Jeans fragmentation scale. On the other hand, for groups with typical protostellar separations larger than 0.4 pc, these separations are always larger than the associated Jeans length. |
| WOS关键词 | YOUNG STELLAR CLUSTERS ; STAR-FORMATION RATES ; MOLECULAR CLOUD ; SPITZER SURVEY ; FRAGMENTATION ; GAS ; ORION ; EVOLUTION ; COLLAPSE ; CORES |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000457181200017 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/18782]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Li, Juan |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 3.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 4.Univ Victoria, Dept Phys & Astron, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada 5.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada 6.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 7.SUNY Coll Fredonia, Dept Phys, 280 Cent Ave, Fredonia, NY 14063 USA |
| 推荐引用方式 GB/T 7714 | Li, Juan,Myers, Philip C.,Kirk, Helen,et al. Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters[J]. ASTROPHYSICAL JOURNAL,2019,871(2):18. |
| APA | Li, Juan,Myers, Philip C.,Kirk, Helen,Gutermuth, Robert A.,Dunham, Michael M.,&Pokhrel, Riwaj.(2019).Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters.ASTROPHYSICAL JOURNAL,871(2),18. |
| MLA | Li, Juan,et al."Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters".ASTROPHYSICAL JOURNAL 871.2(2019):18. |
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来源：紫金山天文台
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