Bibcode
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, O.; Trujillo, Juan David
Bibliographical reference
The Astrophysical Journal, Volume 873, Issue 1, article id. 66, 10 pp. (2019).
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2019
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Citations
10
Refereed citations
10
Description
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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García Hernández