J/ApJ/873/66 Massive stars in SDSS/APOGEE-2. II. W3-W4-W5 (Roman-Lopes+, 2019)
Massive stars in the SDSS-IV/APOGEE-2 survey.
II. OB-stars in the W345 complexes.
Roman-Lopes A., Roman-Zuniga C.G., Tapia M., Hernandez J.,
Ramirez-Preciado V., Stringfellow G.S., Ybarra J.E., Kim J.S., Minniti D.,
Covey K.R., Kounkel M., Suarez G., Borissova J., Garcia-Hernandez D.A.,
Zamora O., Trujillo J.D.
<Astrophys. J., 873, 66 (2019)>
=2019ApJ...873...66R 2019ApJ...873...66R
ADC_Keywords: Stars, OB; Spectra, infrared; Spectral types; Equivalent widths;
Photometry, infrared
Keywords: Galaxy: stellar content; infrared: stars; stars: early-type;
stars: massive; techniques: spectroscopic
Abstract:
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 200pc 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
HeII λ16923 (7-12) and HeII 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∼2kpc. 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.
Description:
The data of the W3-W4-W5 (W345) complexes were collected between fall
2016 and winter 2017.
The survey is made possible through the two Apache Point Observatory
(APO) Galactic Evolution Experiment (APOGEE) instruments: APOGEE-2N
located at the APO, and APOGEE-2S located at the Las Campanas
Observatory (LCO). Each of them is a 300-fiber spectrograph working in
the wavelength range 15000-17000Å in the near-infrared (NIR)
H-band, with a mean resolving power R∼22500.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 74 60 SDSS-IV/APOGEE-2 survey of OB stars in W3-W4-W5
table3.dat 76 60 Line parameters for OB stars in W3-W4-W5 (W345)
--------------------------------------------------------------------------------
See also:
III/76 : Luminous Stars in the Northern Milky Way (LS) (Hardorp+ 1959-1965)
III/230 : Magnitudes & spectral types in 5 galactic fields (Voroshilov+, 1985)
III/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)
III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
III/284 : APOGEE-2 data from DR16 (Majewski+, 2017)
J/ApJS/2/389 : Observations of O and B stars (Hiltner, 1956)
J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)
J/ApJ/541/841 : UBV photometry and ages of Trapezium systems (Abt+, 2000)
J/AJ/129/393 : UBV photometry in W3 (Oey+, 2005)
J/ApJ/688/1142 : Star formation in W5: Spitzer observations (Koenig+, 2008)
J/ApJ/743/39 : Spitzer obs. of W3 molecular cloud (Rivera-Ingraham+, 2011)
J/A+A/554/A3 : Vilnius photometry of IC1805 stars (Straizys+, 2013)
J/MNRAS/439/3719 : Embedded clusters infrared photometry (Chavarria+, 2014)
J/A+A/564/A40 : VFTS. O-type stellar content of 30 Dor (Walborn+, 2014)
J/ApJ/807/27 : IN-SYNC. III. RVs of IC348 stars (Cottaar+, 2015)
J/ApJ/799/136 : IN-SYNC. II. Cand. young stars in NGC 1333 (Foster+, 2015)
J/ApJ/813/42 : O and B type stars in W3: first results (Kiminki+, 2015)
J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)
J/ApJ/822/49 : Cand. YSOs in AFGL 333 with NEWFIRM & Spitzer (Jose+, 2016)
J/ApJS/224/4 : GOSSS III. Additional O-type systems (Maiz Apellaniz+, 2016)
J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016)
J/MNRAS/468/2684 : IC1805 YSOs (Panwar+, 2017)
J/ApJS/230/3 : Optical & Spitzer photometry in IC 1805 (Sung+, 2017)
J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)
J/ApJ/855/68 : SDSS-IV/APOGEE Survey massive stars. I. (Roman-Lopes+, 2018)
J/A+A/638/A76 : StarHorse data for 5 surveys (Queiroz+, 2020)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/60] Running sequence number
4- 21 A18 --- APOGEE2 APOGEE-2 position based identifier
23- 36 A14 --- OName Literature identifier
38- 42 F5.2 mag Hmag [7.16/12.32] 2MASS H magnitude
44- 56 A13 --- SpTl Spectral type from literature
58- 63 A6 --- Classl Luminosity class from literature
65- 70 A6 --- Qual Associated qualifier
73- 74 I2 --- Ref ? References for SpTl and Classl (1)
--------------------------------------------------------------------------------
Note (1): Literature references for spectral type and luminosity class
as follows:
1 = Maiz-Apellaaniz et al. (2016, J/ApJS/224/4);
2 = Hiltner (1956, J/ApJS/2/389);
3 = Sota et al. (2014ApJS..211...10S 2014ApJS..211...10S -- III/274);
4 = Mathys (1989A&AS...81..237M 1989A&AS...81..237M);
5 = Sota et al. (2011ApJS..193...24S 2011ApJS..193...24S -- III/274);
6 = Voroshilov et al. (1985CBVMS.C......0V 1985CBVMS.C......0V -- III/230);
7 = Massey, Juhnson & Degioia-Eastwood (1995, J/ApJ/454/151);
8 = Abt & Corbally (2000, J/ApJ/541/841);
9 = Oey et al. (2005, J/AJ/129/393);
10 = Shi & Hu (1999A&AS..136..313S 1999A&AS..136..313S);
11 = Cohen & Lewis (1978MNRAS.184..801C 1978MNRAS.184..801C);
12 = Kiminki et al. (2015, J/ApJ/813/42);
13 = Hardorp et al. (1959LS....C01....0H 1959LS....C01....0H -- III/76);
14 = Rydstrom (1978, J/A+AS/32/25).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/60] Internal Star ID
4- 7 F4.2 0.1nm EWBr11 [0.4/2.1]? Equivalent width,
Br11 hydrogen recombination
9- 13 F5.2 0.1nm FWHMBr11 [13.3/45.8]? Full width half maximum,
Br11 hydrogen recombination
15- 18 F4.2 0.1nm EWBr13 [0.2/1.6]? Equivalent width,
Br13 hydrogen recombination
20- 24 F5.2 0.1nm FWHMBr13 [16.3/49.9]? Full width half maximum,
Br13 hydrogen recombination
26- 29 F4.2 0.1nm EWHe16 [0.09/0.8]? Equivalent width,
HeII 16923Å (7-12)
31- 35 F5.2 0.1nm FWHMHe16 [8/59.8]? Full width half maximum,
HeII 16923Å (7-12)
37- 40 F4.2 0.1nm EWHe15 [0.1/0.6]? Equivalent width,
HeII 15723Å (7-13)
42- 46 F5.2 0.1nm FWHMHe15 [12.5/30.4]? Full width half maximum,
HeII 15723Å (7-13)
48- 56 A9 --- SpT Spectral Type, this work
58- 62 A5 --- Class Luminosity Class, this work
64- 76 A13 --- SpTl Spectral type from literature
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Roman-Lopes et al. Paper I 2018ApJ...855...68R 2018ApJ...855...68R Cat. J/ApJ/855/68
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Aug-2020