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

被引：7

作者：

Roman-Lopes, Alexandre ^{[1
,2
,3
]}

Roman-Zuniga, Carlos G. ^{[2
]}

Tapia, Mauricio ^{[2
]}

Hernandez, Jesus ^{[2
]}

Ramirez-Preciado, Valeria ^{[2
]}

Stringfellow, Guy S. ^{[4
]}

Ybarra, Jason E. ^{[5
]}

Kim, Jinyoung Serena ^{[6
]}

Minniti, Dante ^{[7
,8
,9
]}

Covey, Kevin R. ^{[10
]}

Kounkel, Marina ^{[10
]}

Suarez, Genaro ^{[2
]}

Borissova, Jura ^{[8
,11
]}

Garcia-Hernandez, D. A. ^{[12
,13
]}

Zamora, Olga ^{[13
]}

Trujillo, Juan David ^{[14
]}

机构：

[1] Univ La Serena, Dept Phys & Astron, Av Juan Cisternas,1200 North, La Serena, Chile

[2] UNAM, Unidad Acad Ensenada, Inst Astron, Ensenada 22860, Baja California, Mexico

[3] Programa Estancias Invest DGAPA UNAM, Ensenada, Baja California, Mexico

[4] Univ Colorado, Dept Astrophys & Planetary Sci, Ctr Astrophys & Space Astron, 389 UCB, Boulder, CO 80309 USA

[5] Bridgewater Coll, Dept Phys, Bridgewater, VA 22801 USA

[6] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA

[7] Univ Andres Bello, Fac Ciencias Exactas, Dept Ciencias Fis, Av Fernandez Concha 700, Santiago, Chile

[8] Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 0436, Chile

[9] Vatican Observ, V-00120 Vatican City, Vatican

[10] Western Washington Univ, Dept Phys & Astron, 516 High St, Bellingham, WA 98225 USA

[11] Univ Valparaiso, Inst Fis & Astron, Av Gran Bretana 1111, Playa Ancha 5030, Casilla, Chile

[12] Inst Astrofis Canarias, E-38205 Tenerife, Spain

[13] ULL, Dept Astrofis, E-38206 Tenerife, Spain

[14] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 873卷 / 01期

基金：

美国国家航空航天局; 美国安德鲁·梅隆基金会;

关键词：

Galaxy: stellar content; infrared: stars; stars: early-type; stars: massive; techniques: spectroscopic; UPPER MAIN-SEQUENCE; CLUSTER IC 1805; SPECTRAL CLASSIFICATION; MOLECULAR CLOUDS; ASSOCIATIONS; POPULATION; EVOLUTION; DATABASE; W5-EAST; LINES;

D O I：

10.3847/1538-4357/ab0305

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 lambda 16923 (7-12) and He II lambda 15723 (7-13) lines contained in the APOGEE spectral bands are useful in providing spectral classification down to one spectral subclass for massive stars in regions as distant as d approximate to 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.

引用

页数：10

共 8 条

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Roman-Lopes, A.
Roman-Zuniga, C.
Tapia, Mauricio
Chojnowski, Drew
Gomez Maqueo Chew, Y.
Garcia-Hernandez, D. A.
Borissova, Jura
Minniti, Dante
Covey, Kevin R.
Longa-Pena, Penelope
Fernandez-Trincado, J. G.
Zamora, Olga
Nitschelm, Christian
ASTROPHYSICAL JOURNAL, 2018, 855 (01):
[2] Massive Stars in the SDSS-IV/APOGEE2 Survey. III. New OB Stars in the Direction of the Sagittarius Spiral Arm
Roman-Lopes, Alexandre
Roman-Zuniga, Carlos G.
Tapia, Mauricio
Minniti, Dante
Borissova, Jura
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2020, 247 (01):
[3] Target Selection for the SDSS-IV APOGEE-2 Survey
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ASTRONOMICAL JOURNAL, 2017, 154 (05):
[4] Massive Stars in the SDSS-IV-APOGEE Survey: Wolf-Rayet Stars of the WN Type
Roman-Lopes, Alexandre
Roman-Zuniga, Carlos G.
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ASTROPHYSICAL JOURNAL, 2020, 891 (02):
[5] The rotation of selected globular clusters and the differential rotation of M3 in multiple populations from the SDSS-IV APOGEE-2 survey
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MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2021, 504 (01) : 1144 - 1151
[6] Quasar Properties from the Sloan Digital Sky Survey. II. The Quasars Obtained by the SDSS-IV in the First Two Years
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[7] Resolved and Integrated Stellar Masses in the SDSS-IV/MaNGA Survey. II. Applications of PCA-based Stellar Mass Estimates
Pace, Zachary J.
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ASTROPHYSICAL JOURNAL, 2019, 883 (01):
[8] New high proper motion stars from the Digitized Sky Survey.: II.: Northern stars with 0".5 yr-1 < μ < 2".0 yr-1 at high Galactic latitudes
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