2015ApJ...813...42K

Query : 2015ApJ...813...42K

2015ApJ...813...42K - Astrophys. J., 813, 42 (2015/November-1)

The O- and B-type stellar population in W3: beyond the high-density layer.

KIMINKI M.M., KIM J.S., BAGLEY M.B., SHERRY W.H. and RIEKE G.H.

Abstract (from CDS):

We present the first results from our survey of the star-forming complex W3, combining VRI photometry with multiobject spectroscopy to identify and characterize the high-mass stellar population across the region. With 79 new spectral classifications, we bring the total number of spectroscopically confirmed O- and B-type stars in W3 to 105. We find that the high-mass slope of the mass function in W3 is consistent with a Salpeter IMF, and that the extinction toward the region is best characterized by an RV of approximately 3.6. B-type stars are found to be more widely dispersed across the W3 giant molecular cloud (GMC) than previously realized: they are not confined to the high-density layer (HDL) created by the expansion of the neighboring W4 H ii region into the GMC. This broader B-type population suggests that star formation in W3 began spontaneously up to 8-10 Myr ago, although at a lower level than the more recent star formation episodes in the HDL. In addition, we describe a method of optimizing sky subtraction for fiber spectra in regions of strong and spatially variable nebular emission.

Abstract Copyright: ∼

Journal keyword(s): dust, extinction - open clusters and associations: individual: Westerhout 3 - stars: early-type - stars: formation - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/813/42): table2.dat>

Simbad objects: 106

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Number of rows : 106
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SA 92- reg 00 55 03.80 +00 47 13.2           ~ 102 0
2 2MASS J02223962+6211528 * 02 22 39.6415486866 +62 11 52.700485453     14.72   13.36 B7V 1 0
3 2MASS J02225013+6149476 * 02 22 50.1308240208 +61 49 47.735324256     16.43 15.47 14.48 B4-7V 1 0
4 2MASS J02225403+6207574 * 02 22 54.0227013744 +62 07 57.448233264     15.20   13.66 B4-5V 1 0
5 2MASS J02225743+6142534 Em* 02 22 57.4370977512 +61 42 53.462741364     15.99 15.08 14.18 B5Ve 2 0
6 2MASS J02230168+6217292 * 02 23 01.6850343936 +62 17 29.205312216     15.92   13.82 B2V 2 0
7 2MASS J02230445+6141093 * 02 23 04.4634101424 +61 41 09.336172164     16.05 15.18 14.27 B9V 1 0
8 2MASS J02231772+6135312 * 02 23 17.7314796888 +61 35 31.101716904     16.50 15.48 14.34 B4-5Ve 1 0
9 2MASS J02240353+6216531 * 02 24 03.5276891064 +62 16 53.123499408     14.17   12.70 B3V 1 0
10 2MASS J02241957+6127403 Y*? 02 24 19.5904204176 +61 27 40.368092832     16.61 15.67 14.69 A1V 2 0
11 2MASS J02242588+6205365 * 02 24 25.8762351912 +62 05 36.510444132     15.62 14.27 13.14 B0-1V 2 0
12 2MASS J02243501+6200417 * 02 24 34.9736176656 +62 00 41.630302872     15.97 14.63 13.36 B1.5V 1 0
13 2MASS J02243575+6159581 * 02 24 35.751 +61 59 58.17     17.77 16.38 15.05 B: 1 0
14 2MASS J02244164+6201271 * 02 24 41.649 +62 01 27.11     17.98 16.63 15.29 B:e 6 0
15 2MASS J02245083+6132050 * 02 24 50.8408374144 +61 32 04.978400928     15.06 14.33 13.57 B6V 1 0
16 2MASS J02245771+6203335 Y*O 02 24 57.7138898040 +62 03 33.506922168     16.80 15.48 14.23 B2V 7 0
17 2MASS J02245871+6201317 Em* 02 24 58.7033409120 +62 01 31.716358104     17.06 15.65 14.21 B3-5Ve 6 0
18 2MASS J02250608+6145476 * 02 25 06.0866715648 +61 45 47.471688792     15.21 14.47 13.69 B7.5V 1 0
19 2MASS J02250651+6138270 * 02 25 06.5215090824 +61 38 27.014169552     15.27 14.57 13.86 B5-6V 1 0
20 2MASS J02251131+6209428 Y*O 02 25 11.3066035344 +62 09 42.781617288     15.85   13.94 B2V 6 0
21 2MASS J02251502+6216191 LP* 02 25 15.0094031902 +62 16 18.998967784     16.01   13.74 B:e 2 0
22 2MASS J02251857+6201169 Y*O 02 25 18.5673797160 +62 01 16.882020768   18.623 16.27 14.48 12.67 O5-7V+O7-9V 10 1
23 IRAS 02214+6136 Y*? 02 25 24.3532288608 +61 51 27.673081848     17.69 16.13 14.71 B: 5 0
24 2MASS J02252827+6211140 Y*O 02 25 28.2717967296 +62 11 13.910585892   17.599 16.19   14.35 B8V 6 1
25 IC 1795 36 Y*O 02 25 31.666032 +62 03 24.94116   16.19 14.66 13.52 12.53 B1V 7 0
26 2MASS J02253258+6206596 Y*O 02 25 32.5801367424 +62 06 59.531472504     18.65   14.70 B0.5V-B2V 11 1
27 2MASS J02253461+6201401 Y*O 02 25 34.6074931056 +62 01 39.968953248   17.751 16.47 15.51 14.60 B7V 9 1
28 2MASS J02253750+6205244 Y*O 02 25 37.5036847680 +62 05 24.356555340     20.26 17.94 15.78 B0-2V 12 0
29 2MASS J02253847+6139007 * 02 25 38.4684724632 +61 39 00.725886432     14.23 13.34 12.45 B2V 2 0
30 2MASS J02253880+6208168 Y*O 02 25 38.7979101576 +62 08 16.792756728   17.505 16.16 14.90 13.86 B2Ve_sh 7 1
31 2MASS J02254334+6206154 Y*O 02 25 43.3302484800 +62 06 15.387396264     19.41 17.68 15.92 O8V-O9V 26 0
32 IC 1795 HII 02 25 43.5 +62 06 13           ~ 247 0
33 2MASS J02254485+6203413 Y*O 02 25 44.8467122304 +62 03 41.200921692   18.097 15.91 14.19 12.59 B0.5V-B2V 18 2
34 2MASS J02254488+6208155 * 02 25 44.8793603472 +62 08 15.498204000   17.841 16.43 15.49 14.53 B4-5V 3 1
35 W 3k HII 02 25 44.9 +62 03 41           ~ 21 1
36 2MASS J02254720+6153430 * 02 25 47.2089445512 +61 53 42.954122544     16.90 15.80 14.74 B3-5V 2 0
37 2MASS J02254748+6206543 Y*O 02 25 47.5196414112 +62 06 54.466000992           B3V-B4V 11 0
38 2MASS J02255220+6156120 * 02 25 52.2047997576 +61 56 11.935573368   17.609 16.28 15.38 14.48 B: 3 1
39 2MASS J02260110+6143237 * 02 26 01.0984165920 +61 43 23.627940600     17.77 16.56 15.32 B5-7V 1 0
40 2MASS J02260587+6158465 Y*O 02 26 05.8608287904 +61 58 46.388553492   16.410 14.96 13.97 12.95 B1.5V 7 1
41 IC 1795 56 * 02 26 07.2873660504 +62 02 54.839730552   16.805 15.62 14.91 14.20 A1V 4 1
42 2MASS J02261050+6158018 * 02 26 10.5003506928 +61 58 01.735845960   18.212 16.71 15.68 14.60 B3V 4 1
43 2MASS J02261690+6207350 Y*O 02 26 16.8972835296 +62 07 34.896776232   19.915 17.62 16.00 14.25 B:epec 9 1
44 2MASS J02261734+6129420 * 02 26 17.3445014544 +61 29 42.025029684     17.95 16.72 15.44 B3-9V 1 0
45 [D75b] Em* 02-071 Y*O 02 26 18.7985020560 +61 59 52.810635516   16.264 15.17 14.41 13.67 B4Ve 14 1
46 IC 1795 90 * 02 26 22.8943177440 +62 00 36.937751148   16.896 15.41 14.25 13.12 B1-2V 5 1
47 2MASS J02262338+6128449 * 02 26 23.3788870464 +61 28 44.966210592     14.49 13.97 13.42 B9V 1 0
48 2MASS J02262442+6200501 * 02 26 24.4182667920 +62 00 50.109784380   19.447 17.52 16.03 14.58 B4-6V 3 1
49 2MASS J02263349+6141164 Y*O 02 26 33.4888093800 +61 41 16.379521872     16.42 15.40 14.20 B3-5V 4 0
50 2MASS J02263433+6201527 Y*O 02 26 34.3154740368 +62 01 52.660868664   15.285 14.38 13.78 13.12 B4-5V 9 1
51 2MASS J02263439+6219350 LP? 02 26 34.3824435744 +62 19 35.066689824           B0-4Ve_sh 2 0
52 BD+61 411 Y*O 02 26 34.3948 +62 00 42.380 11.09 11.14 10.28     O6.5V((f))z 63 0
53 IC 1795 112 * 02 26 41.2981020648 +61 59 24.221893920   15.256 14.27 13.63 12.96 B2V 6 1
54 2MASS J02264173+6158503 Y*O 02 26 41.7301025592 +61 58 50.247596640   19.765 17.68 16.23 14.75 B4-5V 8 1
55 2MASS J02264301+6144339 * 02 26 42.9992471352 +61 44 33.926246232     15.18 14.47 13.67 B5V 1 0
56 2MASS J02264570+6159504 Y*O 02 26 45.6968680656 +61 59 50.401562856   18.170 16.76 15.72 14.66 B6-7V 5 1
57 2MASS J02264642+6135387 Y*O 02 26 46.4225010120 +61 35 38.812044516     17.44 15.66 13.95 B0-4V 3 0
58 IC 1795 111 * 02 26 46.6403352936 +62 00 25.862743692   14.91 13.92 13.25 12.57 B2V 6 1
59 NAME W 3 North HII 02 26 51.14 +62 15 47.2           ~ 93 0
60 2MASS J02265547+6210516 Y*O 02 26 55.4761657608 +62 10 51.607978536   17.690 15.75 14.45 13.13 B1V 5 1
61 2MASS J02265627+6206313 * 02 26 56.2758581352 +62 06 31.226115960   18.073 16.27 14.94 13.59 B0-3V 5 1
62 2MASS J02265752+6138489 * 02 26 57.5003377512 +61 38 48.972274584     17.18 16.33 15.39 A0V 1 0
63 2MASS J02265789+6138462 * 02 26 57.8907342648 +61 38 46.263174288     15.30 14.53 13.71 B8V 1 0
64 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
65 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
66 IC 1795 119 Em* 02 27 09.1619543976 +62 12 52.783472376   16.571 14.86 13.70 12.50 B0-1V 6 1
67 2MASS J02270936+6138415 Y*O 02 27 09.3627118704 +61 38 41.522257788     16.75 15.97 15.15 B9Ve 2 0
68 2MASS J02270938+6154437 Y*O 02 27 09.3760968336 +61 54 43.698691296   19.311 17.44 16.16 14.83 B1-3V 10 1
69 2MASS J02271290+6151390 Y*O 02 27 12.9011229072 +61 51 38.987458668   15.90 14.52 13.49 12.45 B1-2V+B3-4V 9 0
70 2MASS J02271392+6137251 Y*O 02 27 13.9267370040 +61 37 25.137475860     15.63 14.43 13.15 B1V 7 0
71 2MASS J02271510+6200151 Y*? 02 27 15.1094341920 +62 00 15.016567248   16.249 14.73 13.66 12.57 B2V 5 1
72 [D75b] Em* 02-075 Or* 02 27 16.0180744872 +62 00 50.495601672   18.391 16.38 14.77 13.15 B:e 10 1
73 2MASS J02272023+6202023 Y*O 02 27 20.2235843256 +62 02 02.363680284   17.689 16.10 14.82 13.49 B0-1.5Ve_sh 11 1
74 2MASS J02272133+6154570 * 02 27 21.3358828032 +61 54 56.999697516   19.629 17.57 15.83 14.16 B1-4V 6 1
75 2MASS J02273953+6156330 Y*O 02 27 39.5235149784 +61 56 33.012540708     17.39 15.86 14.32 B0-2V 6 0
76 2MASS J02274017+6204197 * 02 27 40.1705983704 +62 04 19.729358868     17.06 15.94 14.81 B1-4V 3 0
77 2MASS J02274456+6140299 Y*O 02 27 44.5662566352 +61 40 29.986953276     16.41 15.17 13.95 B3-6Ve 9 0
78 IC 1795 147 * 02 27 45.3201602880 +62 02 07.810458360   15.39 14.44 13.87 13.30 B4-5V 3 0
79 IC 1795 146 * 02 27 48.3082328112 +62 03 19.592239752   15.40 14.31 13.55 12.80 B1V 3 0
80 2MASS J02275028+6149514 * 02 27 50.2820080248 +61 49 51.435948108     18.11 16.94 15.76 B2V 2 0
81 2MASS J02280084+6205285 * 02 28 00.8390981640 +62 05 28.501658988     17.23 16.23 15.25 B8V 1 0
82 IC 1795 175 * 02 28 01.7184600168 +61 51 39.541117680   15.40 14.45 13.97 13.42 A0V 2 0
83 2MASS J02280319+6150116 * 02 28 03.1862754240 +61 50 11.673708288     16.35 15.32 14.31 B7V 1 0
84 IC 1795 162 * 02 28 03.2534665104 +62 06 27.501841836   15.49 14.23 13.37 12.54 B4-5V 3 0
85 2MASS J02281111+6143034 * 02 28 11.1072223272 +61 43 03.434754864     15.57 14.76 13.94 B8V 1 0
86 2MASS J02281533+6152112 * 02 28 15.3338533248 +61 52 11.216277696     17.26 16.29 15.30 B8V 1 0
87 2MASS J02281694+6132102 * 02 28 16.944 +61 32 10.30     15.00 13.79 12.54 B2-3V 1 0
88 2MASS J02281951+6142185 * 02 28 19.5163288296 +61 42 18.611425152     16.75 15.83 14.91 B9-A1V 1 0
89 2MASS J02282111+6147531 * 02 28 21.1054737840 +61 47 53.104469172     17.91 16.81 15.69 B4V 3 0
90 2MASS J02282402+6158452 * 02 28 24.0133200672 +61 58 45.262118280     15.48 14.53 13.51 B8III 1 0
91 2MASS J02283486+6139165 * 02 28 34.8564934320 +61 39 16.618944528     17.93 16.93 15.82 B3-4V 1 0
92 2MASS J02283823+6139144 * 02 28 38.2317749376 +61 39 14.478150924     15.57 14.84 14.03 B8V 1 0
93 2MASS J02285019+6153009 * 02 28 50.1804656400 +61 53 00.919175748     16.09 15.07 14.02 B2V 2 0
94 IC 1805 7 BS* 02 29 08.8253009136 +61 38 31.477843572 15.52 15.28 14.48 13.94 13.35 B5V 9 0
95 2MASS J02291539+6147160 * 02 29 15.3979743288 +61 47 15.988432308     14.97 14.34   B8V 1 0
96 2MASS J02292199+6137234 Y*O 02 29 21.9888241344 +61 37 23.442957264 15.20 15.01 14.12 13.58 13.03 B7V 6 0
97 2MASS J02292506+6132347 Y*O 02 29 25.0609477656 +61 32 34.717267320 16.44 16.02 15.14 14.56 13.95 B7V 4 0
98 V* KM Cas Or* 02 29 30.4684170480 +61 29 44.163943476 12.21 12.285 11.229 10.990   O9.5V((f)) 53 0
99 2MASS J02294376+6147023 * 02 29 43.7688146160 +61 47 02.351935644     14.98 14.31 13.63 B7V 1 0
100 2MASS J02295419+6144110 * 02 29 54.1955343744 +61 44 11.021150220     14.68 14.11 13.52 B7V 1 0
101 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
102 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
103 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
104 SA 98- reg 06 52 04.1 -00 23 58           ~ 179 0
105 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
106 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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