Abstract

High-resolution near-infrared spectra of several nearby star-forming regions and young clusters have been obtained by the APOGEE spectrograph, which is mounted on the 2.5 m Sloan Digital Sky Survey (SDSS) telescope (Gunn et al. 2006AJ....131.2332G; Blanton et al. 2017AJ....154...28B). The APOGEE spectrographs can observe up to 300 sources simultaneously across a 1.5° field of view, and the instrument covers the spectral range of 1.51-1.7 μm with a typical R~22500 (although it may vary between the individual fibers; Wilson et al. 2010SPIE.7735E..1CW; Majewski et al. 2017AJ....154...94M). The typical limiting magnitude for the observations analyzed here is H~13 mag. The analysis in this work focuses on young stellar objects (YSOs) in the Orion Complex (Da Rio et al. 2016, J/ApJ/818/59; 2017ApJ...845..105D; Kounkel et al. 2018, J/AJ/156/84), NGC 1333 (Foster et al. 2015, J/ApJ/799/136), IC 348 (Cottaar et al. 2015, J/ApJ/807/27), Taurus Molecular Clouds, NGC 2264, α Per, and Pleiades. The observations originally began as part of the SDSS-III IN-SYNC survey with APOGEE and later transitioned into the SDSS-IV Young Clusters Survey with APOGEE-2 with an expanded list of regions, increased footprint on the sky, and additional epochs covering a larger baseline for some of the existing targets. Sources were selected for targeting using the presence of infrared excess, optical variability, and when feasible, identification as a YSO in the literature (Cottle et al. 2018, J/ApJS/236/27). In total, 53452 spectra were obtained for 14823 stars across a ~150 deg² field of view over 6.5 yr, from 2011 September to 2018 March (Table 1).

(4 data files).