The APOGEE-2 Survey of the Orion Star-forming Complex. I. Target Selection and Validation with Early Observations
Covey, Kevin R.
Downes, Juan Jose
Ybarra, Jason E.
Stringfellow, G. S.
Kim, J. Serena
Da Rio, Nicola
De Lee, Nathan
Frinchaboy, Peter M.
Majewski, Steven R.
Mennickent, Ronald E.
Nidever, David L.
AffiliationUniv Arizona, Steward Observ
Keywordsopen clusters and associations: individual (Orion)
stars: pre-main sequence
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationJ'Neil Cottle et al 2018 ApJS 236 27
Rights© 2018. The American Astronomical Society. All rights reserved.
Collection InformationThis 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 email@example.com.
AbstractThe Orion Star-forming Complex (OSFC) is a central target for the APOGEE-2 Young Cluster Survey. Existing membership catalogs span limited portions of the OSFC, reflecting the difficulty of selecting targets homogeneously across this extended, highly structured region. We have used data from wide-field photometric surveys to produce a less biased parent sample of young stellar objects (YSOs) with infrared (IR) excesses indicative of warm circumstellar material or photometric variability at optical wavelengths across the full 420 square degree extent of the OSFC. When restricted to YSO candidates with H < 12.4, to ensure S/N similar to 100 for a six-visit source, this uniformly selected sample includes 1307 IR excess sources selected using criteria vetted by Koenig & Liesawitz (2014) and 990 optical variables identified in the Pan-STARRS1 3 pi survey: 319 sources exhibit both optical variability and evidence of circumstellar disks through IR excess. Objects from this uniformly selected sample received the highest priority for targeting, but required fewer than half of the fibers on each APOGEE-2 plate. We filled the remaining fibers with previously confirmed and new color-magnitude selected candidate OSFC members. Radial velocity measurements from APOGEE-1 and new APOGEE-2 observations taken in the survey's first year indicate that similar to 90% of the uniformly selected targets have radial velocities consistent with Orion membership. The APOGEE-2 Orion survey will include >1100 bona fide YSOs whose uniform selection function will provide a robust sample for comparative analyses of the stellar populations and properties across all sub-regions of Orion.
VersionFinal published version
SponsorsNSF [AST-1449476, AST-11311835]; UNAM-DGAPA-PAPITT [IN116315, IN108117]; BASAL Centro de Astrofisica y Techologas Afines (CATA) [PFB-6/2007]; Ministry for the Economy, Development, and Tourism's Programa Inicativa Cientifica Milenio [IC120009]; Alfred P. Sloan Foundation; U.S. Department of Energy Office of Science; Center for High-Performance Computing at the University of Utah; National Aeronautics and Space Administration; Robert Martin Ayers Sciences Fund