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Roman-Lopes, Alexandre; Román-Zúñiga, Carlos G.; Tapia, Mauricio; Hernández, Jesús; Ramírez-Preciado, Valeria; Stringfellow, Guy S.; Ybarra, Jason E.; Kim, Jinyoung Serena; Minniti, Dante; Covey, Kevin R.; Kounkel, Marina; Suárez, Genaro; Borissova, Jura; García-Hernández, D. A.; Zamora, Olga; Trujillo, Juan David
Astrophysical journal/The Astrophysical journal, 03/2019, Volume: 873, Issue: 1Journal Article
In this work, we have applied a semi-empirical spectral classification method for OB-stars using the APOGEE spectrograph to a sample of candidates in the W3-W4-W5 (W345) complexes. These massive star-forming regions span over 200 pc across the Perseus arm and have a notorious population of massive stars, from which a large fraction are members of various embedded and young open clusters. From 288 APOGEE spectra showing H-band spectral features typical of O- and B-type sources, 46 probably correspond to previously unknown O-type stars. Therefore, we confirm that Br11-Br13 together with He ii λ16923 (7-12) and He ii λ15723 (7-13) lines contained in the APOGEE spectral bands are useful in providing spectral classification down to one spectral sub-class for massive stars in regions as distant as d 2 kpc. The large number of newly found O-type stars as well as the numerous intermediate-mass population confirm that W345 is a very efficient massive star factory, with an integral stellar population probably amounting several thousand solar masses.
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