The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure
Jaehnig, Karl O
Feigelson, Eric D.
Ramírez, Karla Peña
Rio, Nicola Da
Stringfellow, Guy S
Kim, J. Serena
Fernández-Trincado, José G.
García-Hernández, D. A.
AffiliationUniv Arizona, Steward Observ
Keywordsopen clusters and associations: individual (Orion Complex)
stars: kinematics and dynamics
stars: pre-main sequence
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PublisherIOP PUBLISHING LTD
CitationMarina Kounkel et al 2018 AJ 156 84
Rights© 2018. The American Astronomical Society. All rights reserved.
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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.
VersionFinal published version
SponsorsNSF [AST-1449476]; Research Corporation via a Time Domain Astrophysics Scialog award ; UNAM-DGAPA-PAPIIT, Mexico [IN103017]; FONDECYT REGULAR project ; 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 University