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dc.contributor.authorKounkel, Marina
dc.contributor.authorCovey, Kevin
dc.contributor.authorSuárez, Genaro
dc.contributor.authorRomán-Zúñiga, C.
dc.contributor.authorHernandez, Jesus
dc.contributor.authorStassun, Keivan
dc.contributor.authorJaehnig, Karl O
dc.contributor.authorFeigelson, Eric D.
dc.contributor.authorRamírez, Karla Peña
dc.contributor.authorRoman-Lopes, Alexandre
dc.contributor.authorRio, Nicola Da
dc.contributor.authorStringfellow, Guy S
dc.contributor.authorKim, J. Serena
dc.contributor.authorBorissova, Jura
dc.contributor.authorFernández-Trincado, José G.
dc.contributor.authorBurgasser, Adam
dc.contributor.authorGarcía-Hernández, D. A.
dc.contributor.authorZamora, Olga
dc.contributor.authorPan, Kaike
dc.contributor.authorNitschelm, Christian
dc.date.accessioned2018-12-05T21:06:11Z
dc.date.available2018-12-05T21:06:11Z
dc.date.issued2018-09
dc.identifier.citationMarina Kounkel et al 2018 AJ 156 84en_US
dc.identifier.issn1538-3881
dc.identifier.doi10.3847/1538-3881/aad1f1
dc.identifier.urihttp://hdl.handle.net/10150/631112
dc.description.abstractWe present an analysis of spectroscopic and astrometric data from APOGEE-2 and Gaia DR2 to identify structures toward the Orion Complex. By applying a hierarchical clustering algorithm to the six-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages ranging from 1 to 12 Myr. We also investigate the star-forming history within the Orion Complex and identify peculiar subclusters. With this method we reconstruct the older populations in the regions that are currently largely devoid of molecular gas, such as Orion C (which includes the sigma Ori cluster) and Orion D (the population that traces Ori OB1a, OB1b, and Orion X). We report on the distances, kinematics, and ages of the groups within the Complex. The Orion D group is in the process of expanding. On the other hand, Orion B is still in the process of contraction. In lambda Ori the proper motions are consistent with a radial expansion due to an explosion from a supernova; the traceback age from the expansion exceeds the age of the youngest stars formed near the outer edges of the region, and their formation would have been triggered when they were halfway from the cluster center to their current positions. We also present a comparison between the parallax and proper-motion solutions obtained by Gaia DR2 and those obtained toward star-forming regions by the Very Long Baseline Array.en_US
dc.description.sponsorshipNSF [AST-1449476]; Research Corporation via a Time Domain Astrophysics Scialog award [24217]; UNAM-DGAPA-PAPIIT, Mexico [IN103017]; FONDECYT REGULAR project [1170476]; CONICYT PAI Concurso Nacional de Insercion en la Academia [PAI79160052]; Ministry for the Economy, Development and Tourism, Programa Iniciativa Cientica Milenio grant [IC120009]; Spanish Ministry of Economy and Competitiveness (MINECO) [AYA-2017-88254-P]; Alfred P. Sloan Foundation; U.S. Department of Energy Office of Science; Center for High-Performance Computing at the University of Utah; Brazilian Participation Group; Carnegie Institution for Science, Carnegie Mellon University; Chilean Participation Group; French Participation Group; Harvard-Smithsonian Center for Astrophysics; Instituto de Astrofisica de Canarias; Johns Hopkins University; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo; Lawrence Berkeley National Laboratory; Leibniz Institut fur Astrophysik Potsdam (AIP); Max-Planck-Institut fur Astronomie (MPIA Heidelberg); Max-Planck- Institut fur Astrophysik (MPA Garching); Max-Planck-Institut fur Extraterrestrische Physik (MPE); National Astronomical Observatories of China; New Mexico State University; New York University; University of Notre Dame; Observatario Nacional/MCTI; Ohio State University; Pennsylvania State University; Shanghai Astronomical Observatory; United Kingdom Participation Group; Universidad Nacional Autonoma de Mexico; University of Arizona; University of Colorado Boulder; University of Oxford; University of Portsmouth; University of Utah; University of Virginia; University of Washington; University of Wisconsin; Vanderbilt University; Yale Universityen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/1538-3881/156/i=3/a=84?key=crossref.be58299c24059271fdd3979cbbd79c4fen_US
dc.rights© 2018. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectopen clusters and associations: individual (Orion Complex)en_US
dc.subjectstars: kinematics and dynamicsen_US
dc.subjectstars: pre-main sequenceen_US
dc.titleThe APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structureen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTRONOMICAL JOURNALen_US
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_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astronomical Journal
dc.source.volume156
dc.source.issue3
dc.source.beginpage84
refterms.dateFOA2018-12-05T21:06:11Z


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