TY - JOUR
T1 - Massive Stars in the SDSS-IV/APOGEE-2 Survey. II. OB-stars in the W345 Complexes
AU - Roman-Lopes, Alexandre
AU - Román-Zúñiga, Carlos G.
AU - Tapia, Mauricio
AU - Hernández, Jesús
AU - Ramírez-Preciado, Valeria
AU - Stringfellow, Guy S.
AU - Ybarra, Jason E.
AU - Kim, Jinyoung Serena
AU - Minniti, Dante
AU - Covey, Kevin R.
AU - Kounkel, Marina
AU - Suárez, Genaro
AU - Borissova, Jura
AU - García-Hernández, D. A.
AU - Zamora, Olga
AU - Trujillo, Juan David
N1 - Funding Information:
A.R.-L. acknowledges financial support provided in Chile by Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) through the FONDECYT project 1170476 and by the QUIMAL project 130001, and support in Mexico from the PREI DGAPA UNAM program for academic exchange scholarship. C.R.-Z., M.T., J.H., and V.R.P. acknowledge support from UNAM-PAPIIT grants IN-108117, IN-104316, IA-103017. M.K. acknowledges support provided by the NSF through grant AST-1449476, and from the Research Corporation via a Time Domain Astrophysics Scialog award (#24217). G.S.S. was supported in part by NASA grant NNX13AF34G. D.M. is supported by the BASAL Center for Astro-physics and Associated Technologies (CATA) through grant AFB-170002, by the Ministry for the Economy, Development and Tourism, Programa Iniciativa Científica Milenio grant IC120009, awarded to the Millennium Institute of Astrophysics (MAS), and by FONDECYT No. 1170121. J.B. gratefully acknowledges support by the Ministry for the Economy, Development, and Tourism’s Millennium Science Initiative through grant IC 120009, awarded to the Millennium Institute of Astrophysics (MAS). D.A.G.H. and O.Z. acknowledge support provided by the Spanish Ministry of Economy and Competitiveness (MINECO) under grant AYA-2017-88254-P. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir for kind support during observations. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS website iswww.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France—Wenger et al. (2000). This research has made use of the VizieR catalog access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in Ochsenbein et al. (2000). This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved..
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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.
AB - 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.
KW - Galaxy: stellar content
KW - infrared: stars
KW - stars: early-type
KW - stars: massive
KW - techniques: spectroscopic
UR - http://www.scopus.com/inward/record.url?scp=85063583765&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab0305
DO - 10.3847/1538-4357/ab0305
M3 - Review article
AN - SCOPUS:85063583765
SN - 0004-637X
VL - 873
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 66
ER -