The APOGEE-2 Survey of the Orion Star-forming Complex. I. Target Selection and Validation with Early Observations

J'Neil Cottle, Kevin R. Covey, Genaro Suárez, Carlos Román-Zúñiga, Edward Schlafly, Juan Jose Downes, Jason E. Ybarra, Jesus Hernandez, Keivan Stassun, Guy S. Stringfellow, Konstantin Getman, Eric Feigelson, Jura Borissova, J. Serena Kim, A. Roman-Lopes, Nicola Da Rio, Nathan De Lee, Peter M. Frinchaboy, Marina Kounkel, Steven R. MajewskiRonald E. Mennickent, David L. Nidever, Christian Nitschelm, Kaike Pan, Matthew Shetrone, Gail Zasowski, Ken Chambers, Eugene Magnier, Jeff Valenti

Research output: Contribution to journalReview articlepeer-review

23 Scopus citations


The 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 ∼ 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 3π 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 ∼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.

Original languageEnglish (US)
Article number27
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Jun 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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