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Stars that Move Together Were Born Together

文献类型：期刊论文

作者Kamdar, Harshil1; Conroy, Charlie1; Ting, Yuan-Sen2,3,4; Bonaca, Ana1; Smith, Martin5; Brown, Anthony G. A.6
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2019-10-20
卷号884期号:2页码:6
关键词Galaxy: evolution Galaxy: kinematics and dynamics open clusters and associations: general
ISSN号2041-8205
DOI10.3847/2041-8213/ab4997
英文摘要It is challenging to reliably identify stars that were born together outside of actively star-forming regions and bound stellar systems. However, conatal stars should be present throughout the Galaxy, and their demographics can shed light on the clustered nature of star formation and the dynamical state of the disk. In previous work we presented a set of simulations of the Galactic disk that followed the clustered formation and dynamical evolution of 4 billion individual stars over the last 5 Gyr. The simulations predict that a high fraction of comoving stars with physical and 3D velocity separation of Delta r < 20 pc and Delta v < 1.5 km s(-1) are conatal. In this Letter, we use Gaia DR2 and LAMOST DR4 data to identify and study comoving pairs. We find that the distribution of relative velocities and separations of pairs in the data is in good agreement with the predictions from the simulation. We identify 111 comoving pairs in the solar neighborhood with reliable astrometric and spectroscopic measurements. These pairs show a strong preference for having similar metallicities when compared to random field pairs. We therefore conclude that these pairs were very likely born together. The simulations predict that conatal pairs are born in clusters that follow the overall cluster mass function and in relatively young (<1 Gyr) star clusters. Gaia will eventually deliver well-determined metallicities for the brightest stars, enabling the identification of thousands of conatal pairs due to disrupting star clusters in the solar neighborhood.
WOS关键词WIDE BINARIES ; EVOLUTION ; CATALOG ; DISK
资助项目FAS Division of Science, Research Computing Group at Harvard University ; DOE CSGF[DE-FG02-97ER25308] ; Packard Foundation ; NASA Hubble Fellowship - Space Telescope Science Institute[HST-HF2-51425.001] ; National Key Basic Research and Development Program of China[2018YFA0404501] ; NSFC[11673083] ; KITP by the Heising-Simons Foundation ; National Science Foundation[NSF PHY-1748958]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000516538200015
出版者IOP PUBLISHING LTD
资助机构FAS Division of Science, Research Computing Group at Harvard University ; FAS Division of Science, Research Computing Group at Harvard University ; DOE CSGF ; DOE CSGF ; Packard Foundation ; Packard Foundation ; NASA Hubble Fellowship - Space Telescope Science Institute ; NASA Hubble Fellowship - Space Telescope Science Institute ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; KITP by the Heising-Simons Foundation ; KITP by the Heising-Simons Foundation ; National Science Foundation ; National Science Foundation ; FAS Division of Science, Research Computing Group at Harvard University ; FAS Division of Science, Research Computing Group at Harvard University ; DOE CSGF ; DOE CSGF ; Packard Foundation ; Packard Foundation ; NASA Hubble Fellowship - Space Telescope Science Institute ; NASA Hubble Fellowship - Space Telescope Science Institute ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; KITP by the Heising-Simons Foundation ; KITP by the Heising-Simons Foundation ; National Science Foundation ; National Science Foundation ; FAS Division of Science, Research Computing Group at Harvard University ; FAS Division of Science, Research Computing Group at Harvard University ; DOE CSGF ; DOE CSGF ; Packard Foundation ; Packard Foundation ; NASA Hubble Fellowship - Space Telescope Science Institute ; NASA Hubble Fellowship - Space Telescope Science Institute ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; KITP by the Heising-Simons Foundation ; KITP by the Heising-Simons Foundation ; National Science Foundation ; National Science Foundation ; FAS Division of Science, Research Computing Group at Harvard University ; FAS Division of Science, Research Computing Group at Harvard University ; DOE CSGF ; DOE CSGF ; Packard Foundation ; Packard Foundation ; NASA Hubble Fellowship - Space Telescope Science Institute ; NASA Hubble Fellowship - Space Telescope Science Institute ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; NSFC ; NSFC ; KITP by the Heising-Simons Foundation ; KITP by the Heising-Simons Foundation ; National Science Foundation ; National Science Foundation
源URL[http://ir.bao.ac.cn/handle/114a11/55625]  
专题中国科学院国家天文台
通讯作者Kamdar, Harshil
作者单位1.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
2.Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA
3.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
4.Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA
5.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
6.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
推荐引用方式
GB/T 7714		 Kamdar, Harshil,Conroy, Charlie,Ting, Yuan-Sen,et al. Stars that Move Together Were Born Together[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,884(2):6.
APA Kamdar, Harshil,Conroy, Charlie,Ting, Yuan-Sen,Bonaca, Ana,Smith, Martin,&Brown, Anthony G. A..(2019).Stars that Move Together Were Born Together.ASTROPHYSICAL JOURNAL LETTERS,884(2),6.
MLA Kamdar, Harshil,et al."Stars that Move Together Were Born Together".ASTROPHYSICAL JOURNAL LETTERS 884.2(2019):6.

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