Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.3847/1538-3881/ab13b1 |
| Close Companions around Young Stars | |
| Kounkel, Marina1; Covey, Kevin1; Moe, Maxwell2; Kratter, Kaitlin M.2; Suarez, Genaro3; Stassun, Keivan G.4; Roman-Zuniga, Carlos3; Hernandez, Jesus3; Kim, Jinyoung Serena2; Pena Ramirez, Karla5; Roman-Lopes, Alexandre6; Stringfellow, Guy S.7; Jaehnig, Karl O.4; Borissova, Jura8,9; Tofflemire, Benjamin10; Krolikowski, Daniel10; Rizzuto, Aaron10; Kraus, Adam10; Badenes, Carles11; Longa-Pena, Penelope5; Maqueo Chew, Yilen Gomez12; Barba, Rodolfo6; Nidever, David L.13,14; Brown, Cody13; De Lee, Nathan4,15; Pan, Kaike16,17; Bizyaev, Dmitry16,17,18; Oravetz, Daniel16,17; Oravetz, Audrey16,17 | |
| 通讯作者 | Kounkel, Marina |
| 来源期刊 | ASTRONOMICAL JOURNAL
 |
| ISSN | 0004-6256 |
| EISSN | 1538-3881 |
| 出版年 | 2019 |
| 卷号 | 157期号:5 |
| 英文摘要 | Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a stringent probe of the physics of star formation. The distribution of close companions around young stars is still poorly constrained by observations. We present an analysis of stellar multiplicity derived from Apache Point Observatory Galactic Evolution Experiment-2 spectra obtained in targeted observations of nearby star-forming regions. This is the largest homogeneously observed sample of high-resolution spectra of young stars. We developed an autonomous method to identify double-lined spectroscopic binaries (SB2s). Out of 5007 sources spanning the mass range of similar to 0.05-1.5 M-circle dot, we find 399 binaries, including both radial velocity (RV) variables and SB2s. The mass ratio distribution of SB2s is consistent with being uniform for q < 0.95 with an excess of twins for q > 0.95. The period distribution is consistent with what has been observed in close binaries (< 10 au) in the evolved populations. Three systems are found to have q similar to 0.1, with a companion located within the brown dwarf desert. There are no strong trends in the multiplicity fraction as a function of cluster age from 1 to 100 Myr. There is a weak dependence on stellar density, with companions being most numerous at Sigma(*) similar to 30 stars/pc(-2) and decreasing in more diffuse regions. Finally, disk-bearing sources are deficient in SB2s (but not RV variables) by a factor of similar to 2; this deficit is recovered by the systems without disks. This may indicate a quick dispersal of disk material in shortperiod equal-mass systems that is less effective in binaries with lower q. |
| 英文关键词 | binaries: spectroscopic stars: pre-main sequence |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | USA ; Mexico ; Chile ; Russia |
| 开放获取类型 | Bronze, Green Published, Green Submitted |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000466578300006 |
| WOS关键词 | ORION NEBULA CLUSTER ; LOW-MASS STARS ; SOLAR-TYPE ; STELLAR MULTIPLICITY ; SIGMA-ORIONIS ; BROWN DWARF ; BINARY ; DISKS ; FRAGMENTATION ; KINEMATICS |
| WOS类目 | Astronomy & Astrophysics |
| WOS研究方向 | Astronomy & Astrophysics |
| 来源机构 | University of Arizona ; Universidad Nacional Autónoma de México ; New Mexico State University |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/214424 |
| 作者单位 | 1.Western Washington Univ, Dept Phys & Astron, 516 High St, Bellingham, WA 98225 USA; 2.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA; 3.Univ Nacl Autonoma Mexico, Inst Astron, Unidad Acad Ensenada, Ensenada 22860, Baja California, Mexico; 4.Vanderbilt Univ, Dept Phys & Astron, VU Stn 1807, Nashville, TN 37235 USA; 5.Univ Antofagasta, Ctr Astron CITEVA, Av Angamos 601, Antofagasta, Chile; 6.Univ La Serena, Dept Phys & Astron, Av Juan Cisternas,1200 North, La Serena, Chile; 7.Univ Colorado, Ctr Astrophys & Space Astron, Dept Astrophys & Planetary Sci, 389 UCB, Boulder, CO 80309 USA; 8.Univ Valparaiso, Inst Fis & Astron, Av Gran Bretana 1111,Casilla 5030, Playa Ancha, Chile; 9.Millennium Inst Astrophys, Santiago, Chile; 10.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA; 11.Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA; 12.Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico; 13.Montana State Univ, Dept Phys, POB 173840, Bozeman, MT 59717 USA; 14.Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA; 15.Northern Kentucky Univ, Dept Phys Geol & Engn Technol, Highland Hts, KY 41099 USA; 16.Apache Point Observ, POB 59, Sunspot, NM 88349 USA; 17.New Mexico State Univ, POB 59, Sunspot, NM 88349 USA; 18.Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia |
| 推荐引用方式 GB/T 7714 | Kounkel, Marina,Covey, Kevin,Moe, Maxwell,et al. Close Companions around Young Stars[J]. University of Arizona, Universidad Nacional Autónoma de México, New Mexico State University,2019,157(5). |
| APA | Kounkel, Marina.,Covey, Kevin.,Moe, Maxwell.,Kratter, Kaitlin M..,Suarez, Genaro.,...&Oravetz, Audrey.(2019).Close Companions around Young Stars.ASTRONOMICAL JOURNAL,157(5). |
| MLA | Kounkel, Marina,et al."Close Companions around Young Stars".ASTRONOMICAL JOURNAL 157.5(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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