Details

Autor(en) / Beteiligte

• 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

Titel

Massive Stars in the SDSS-IV/APOGEE-2 Survey. II. OB-stars in the W345 Complexes

Ist Teil von

• The Astrophysical journal, 2019-03, Vol.873 (1), p.66

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.