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

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

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Journal Article

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

MPS-Authors

Cottle, J. 'Neil
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Covey, Kevin R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suárez, Genaro
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Román-Zúñiga, Carlos
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schlafly, Edward
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Downes, Juan Jose
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ybarra, Jason E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hernandez, Jesus
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stassun, Keivan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stringfellow, Guy S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Getman, Konstantin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Feigelson, Eric
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Borissova, Jura
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, J. Serena
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Roman-Lopes, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Da Rio, Nicola
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

De Lee, Nathan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Frinchaboy, Peter M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kounkel, Marina
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Majewski, Steven R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mennickent, Ronald E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nidever, David L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nitschelm, Christian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pan, Kaike
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shetrone, Matthew
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zasowski, Gail
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chambers, Ken
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Magnier, Eugene
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Valenti, Jeff
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018ApJS..236...27C
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Citation

Cottle, J. '., Covey, K. R., Suárez, G., Román-Zúñiga, C., Schlafly, E., Downes, J. J., et al. (2018). The APOGEE-2 Survey of the Orion Star-forming Complex. I. Target Selection and Validation with Early Observations. The Astrophysical Journal Supplement Series, 236.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CE38-5

Abstract

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.