TY - JOUR
T1 - Massive Stars in the SDSS-IV-APOGEE Survey
T2 - Wolf-Rayet Stars of the WN Type
AU - Roman-Lopes, Alexandre
AU - Román-Zúñiga, Carlos G.
AU - Borissova, Jura
AU - Ramírez-Preciado, Valeria
AU - Hernández, Jesús
AU - Minniti, Dante
N1 - Publisher Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/3/10
Y1 - 2020/3/10
N2 - In this paper, we describe the results obtained in our study of Galactic Wolf-Rayet stars of the WN type, using the APOGEE2 spectrographs. The APOGEE2 WN star near-infrared spectra presented here were selected through a careful examination of the APOGEE2 DR16 sample, being compound of at least one exemplar of each Wolf-Rayet star from WN4 to WN11 types. Besides the APOGEE2 WN sample, we also identified three new Galactic exemplars of the WN type. The first is WR 147-1, a narrow-lined Wolf-Rayet star of the WN4-5 type located in the direction of the Cygnus-X North complex. The two remaining objects, WR 48-11 and WR 48-12, are found at projected angular distances of several arcminutes southwest from the Danks 1 cluster. WR 48-12 has an estimated heliocentric distance of 7.0-3.0 +5.0 kpc, which is not compatible (within the quoted uncertainties) with that of about 3.8 ± 0.6 kpc for the G305 complex. On the other hand, WR 48-11 has a probable heliocentric distance of 19.0-4.7 +6.5 kpc, which is about three times that of the former, implying that it is probably placed well behind the G305 complex, perhaps at the outermost portion of the Perseus arm.
AB - In this paper, we describe the results obtained in our study of Galactic Wolf-Rayet stars of the WN type, using the APOGEE2 spectrographs. The APOGEE2 WN star near-infrared spectra presented here were selected through a careful examination of the APOGEE2 DR16 sample, being compound of at least one exemplar of each Wolf-Rayet star from WN4 to WN11 types. Besides the APOGEE2 WN sample, we also identified three new Galactic exemplars of the WN type. The first is WR 147-1, a narrow-lined Wolf-Rayet star of the WN4-5 type located in the direction of the Cygnus-X North complex. The two remaining objects, WR 48-11 and WR 48-12, are found at projected angular distances of several arcminutes southwest from the Danks 1 cluster. WR 48-12 has an estimated heliocentric distance of 7.0-3.0 +5.0 kpc, which is not compatible (within the quoted uncertainties) with that of about 3.8 ± 0.6 kpc for the G305 complex. On the other hand, WR 48-11 has a probable heliocentric distance of 19.0-4.7 +6.5 kpc, which is about three times that of the former, implying that it is probably placed well behind the G305 complex, perhaps at the outermost portion of the Perseus arm.
UR - http://www.scopus.com/inward/record.url?scp=85084033741&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab72a6
DO - 10.3847/1538-4357/ab72a6
M3 - Article
AN - SCOPUS:85084033741
SN - 0004-637X
VL - 891
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 107
ER -