NGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A

doi:10.3847/1538-3881/aa647b

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	NGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A
	Fang,Min 3; Kim,Jinyoung Serena 3; Pascucci,Ilaria 4; Apai,Dániel 3,4; Zhang,Lan 5,6; Sicilia-Aguilar,Aurora 7; Alonso-Martínez,Miguel 2; Eiroa,Carlos 2; Wang,Hongchi 1
刊名	The Astronomical Journal
	2017-03-30
卷号	153 期号:4
关键词	accretion, accretion disks protoplanetary disks stars: pre-main sequence
ISSN号	0004-6256
DOI	10.3847/1538-3881/aa647b
英文摘要	Abstract We perform a spectroscopic survey of the foreground population in Orion?A with MMT/Hectospec. We use these data, along with archival spectroscopic data and photometric data, to derive spectral types, extinction values, and masses for 691 stars. Using the Spitzer Space Telescope data, we characterize the disk properties of these sources. We identify 37 new transition disk (TD) objects, 1 globally depleted disk candidate, and 7 probable young debris disks. We discover an object with a mass of?less than 0.018–0.030 M⊙, which harbors a flaring disk. Using the Hα emission line, we characterize the accretion activity of the sources with disks, and confirm that the?fraction of accreting TDs is lower than that of optically thick disks (46% ± 7% versus 73% ± 9%, respectively). Using kinematic data from the Sloan Digital Sky Survey and APOGEE INfrared Spectroscopy of the Young Nebulous Clusters program (IN-SYNC), we confirm that the foreground population shows similar kinematics to their local molecular clouds and other young stars in the same regions. Using the isochronal ages, we find that the foreground population has a median age of?around 1–2 Myr, which is similar to that of other young stars in Orion?A. Therefore, our results argue against the presence of a large and old foreground cluster in front of Orion?A.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-6256-153-4-AA647B
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/36080]
专题	中国科学院国家天文台
作者单位	1.Purple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 2 West Beijing Road, 210008 Nanjing, China 2.Departamento de Fisica Teorica, Facultad de Ciencias, Universidad Autonoma de Madrid, E-28049 Cantoblanco, Madrid, Spain 3.Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA 4.Department of Planetary Sciences, University of Arizona, 1629 East University Boulevard, Tucson, AZ 85721, USA 5.Key Lab of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012 Beijing, China 6.CAS South America Center for Astronomy, Camino El observatorio #1515, Las Condes, Santiago, Chile 7.SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, UK
推荐引用方式 GB/T 7714	Fang,Min,Kim,Jinyoung Serena,Pascucci,Ilaria,et al. NGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A[J]. The Astronomical Journal,2017,153(4).
APA	Fang,Min.,Kim,Jinyoung Serena.,Pascucci,Ilaria.,Apai,Dániel.,Zhang,Lan.,...&Wang,Hongchi.(2017).NGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A.The Astronomical Journal,153(4).
MLA	Fang,Min,et al."NGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A".The Astronomical Journal 153.4(2017).