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dc.contributor.authorFang, Min
dc.contributor.authorKim, Jinyoung Serena
dc.contributor.authorPascucci, Ilaria
dc.contributor.authorApai, Dániel
dc.contributor.authorZhang, Lan
dc.contributor.authorSicilia-Aguilar, Aurora
dc.contributor.authorAlonso-Martínez, Miguel
dc.contributor.authorEiroa, Carlos
dc.contributor.authorWang, Hongchi
dc.date.accessioned2017-06-02T00:40:42Z
dc.date.available2017-06-02T00:40:42Z
dc.date.issued2017-03-30
dc.identifier.citationNGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A 2017, 153 (4):188 The Astronomical Journalen
dc.identifier.issn1538-3881
dc.identifier.doi10.3847/1538-3881/aa647b
dc.identifier.urihttp://hdl.handle.net/10150/623807
dc.description.abstractWe 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-circle dot, which harbors a flaring disk. Using the Ha 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.
dc.description.sponsorshipNational Aeronautics and Space Administration [NNX15AD94G]; National Science Foundation of China (NSFC) [11303037, 11390371/2]; Chinese Academy of Sciences (CAS) through a CAS-CONICYT Postdoctoral Fellowship; National Astronomical Observatories of China; Chinese Academy of Sciences [XDB09000000]; Ministry of Financeen
dc.language.isoenen
dc.publisherIOP PUBLISHING LTDen
dc.relation.urlhttp://stacks.iop.org/1538-3881/153/i=4/a=188?key=crossref.82a20b91c7a5f962e5ee4b196b70f414en
dc.rights© 2017. The American Astronomical Society. All rights reserved.en
dc.subjectaccretion, accretion disksen
dc.subjectprotoplanetary disksen
dc.subjectstars: pre-main sequence Supporting material: machine-readable tablesen
dc.titleNGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion Aen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Astronen
dc.contributor.departmentUniv Arizona, Dept Planetary Scien
dc.identifier.journalThe Astronomical Journalen
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2018-05-18T05:05:00Z
html.description.abstractWe 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-circle dot, which harbors a flaring disk. Using the Ha 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.


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