2005A&A...440..121B


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET23:11:41

2005A&A...440..121B - Astronomy and Astrophysics, volume 440, 121-137 (2005/9-2)

VLT K-band spectroscopy of massive stars deeply embedded in IRAS sources with UCHII colours.

BIK A., KAPER L., HANSON M.M. and SMITS M.

Abstract (from CDS):

We have obtained high resolution (R=10000) K-band spectra of candidate young massive stars deeply embedded in (ultra-) compact HII regions (UCHIIs). These objects were selected from a near-infrared survey of 44 fields centered on IRAS sources with UCHII colours. Often, the near-infrared counterpart of the IRAS source is a young embedded cluster hosting massive stars. In these clusters, three types of objects are identified. The first type (38 objects) consists of ``naked'' OB stars whose K-band spectra are dominated by photospheric emission. We classify the K-band spectra of the OB-type cluster members using near-infrared classification criteria. A few of them have a very early (O3-O4 V) spectral type, consistent with a young age of the embedded clusters. The spectral classification provides an important constraint on the distance to the embedded cluster. The ionising power of the population thus derived is compared to the information obtained from the infrared and radio flux of these sources. In most cases these two different determinations of the ionising flux are consistent, from which we conclude that we have identified the ionising star(s) in about 50% of the embedded clusters. The second type (7 objects) are point sources associated with UCHII radio emission, that exhibit nebular emission lines in the near-infrared. Six of the objects in this group produce HeI emission indicative of an embedded O-type star. These objects are more embedded than the OB stars and probably do not dominate the infrared flux as measured by IRAS. They may emit the bulk of their reprocessed UV radiation at mm wavelengths. The third type (20 objects) is characterised by broad (100-200km/s) Brγ emission and no photospheric absorption profiles. Bik et al. (2005, A&A, submitted) show that these objects are massive YSO candidates surrounded by dense circumstellar disks.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: formation - stars: distances - ISM: HII regions - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/440/121): table6.dat>

Nomenclature: Tables 3, 4, 5: [BKH2005] HHMMmnrNNNNA N=50.

CDS comments: Table 4 17175nr57 is a probable misprint for [BKH2005] 17175nr59

Simbad objects: 88

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Number of rows : 88

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9607 1
2 V* HZ Aur a2* 05 06 08.3583752373 +33 55 07.279474095   7.03 7.07     B9p 172 0
3 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1077 1
4 RAFGL 5180 SFR 06 08 54.1 +21 38 25           ~ 110 0
5 [BKH2005] 06058nr221 * 06 08 55.10 +21 37 55.5           B 1 0
6 2MASS J06090728+2150402 Y*O 06 09 07.284 +21 50 40.24           ~ 10 0
7 IRAS 06061+2151 SFR 06 09 07.8 +21 50 39           ~ 81 0
8 NGC 2183 RNe 06 10 46.75 -06 12 44.9           ~ 73 1
9 RAFGL 890S IR 06 10 50.60928 -06 11 51.2772           ~ 74 1
10 NAME GGD 12-15 OpC 06 10 52 -06 12.8           ~ 139 1
11 HD 43726 * 06 18 32.8068746424 +19 34 20.032596257   8.85 8.75     A1V 9 0
12 IRAS 06412-0105 IR 06 43 48.51912 -01 08 19.0248           ~ 19 0
13 HD 48829 * 06 45 12.5875209798 -02 05 44.901891548   9.27 9.22     B5II/III 8 0
14 RAFGL 5216 HII 06 59 16.7 -03 59 35           ~ 55 0
15 DG 121 HII 07 32 09.9 -16 58 14           ~ 50 0
16 HD 65674 * 07 59 16.7134815851 -16 50 46.891685802   8.62 8.56     A0V 12 0
17 NAME VELA MOL RIDGE MoC 08 53 -45.0           ~ 134 0
18 NAME Vela C Cld 08 57 -43.2           ~ 127 0
19 IRAS 08563-4711 HII 08 58 04.2 -47 22 57           ~ 24 2
20 2MASS J08592167-4345310 Y*O 08 59 21.6674114813 -43 45 31.111580768           ~ 7 0
21 MSX5C G265.1485+01.4474 HII 08 59 25.2 -43 45 46           ~ 33 1
22 2MASS J08592733-4345258 Y*O 08 59 27.339 -43 45 25.84           O9V 5 0
23 2MASS J08592754-4345284 Y*O 08 59 27.5550375554 -43 45 28.664519189           O9.7V 5 0
24 [BKH2005] 08576nr179 * 08 59 27.74 -43 45 38.2           B2.5IV 2 0
25 2MASS J08592851-4346029 Y*O 08 59 28.5178931335 -43 46 02.923636021           A3IV 4 0
26 GAL 268.4-00.9 HII 09 01 54.3 -47 43 59           ~ 49 1
27 NAME Vela B MoC 09 04 -48.0           ~ 25 0
28 HD 80055 * 09 16 10.9759118914 -43 32 59.234199973   8.86 8.78     A0V 7 0
29 HD 80998 * 09 21 25.3427691127 -47 39 10.894152493   8.79 8.84     B8V 7 0
30 RAFGL 4101 HII 10 06 39.8 -57 12 29           ~ 18 0
31 HD 91373 * 10 31 40.6798319071 -57 18 43.404112882   8.91 8.85     A0Vn 9 0
32 HD 303311 SB* 10 44 37.4603321026 -59 32 55.459963798 8.30 9.042 8.979 9.58 9.09 O6V((f))z 75 0
33 HD 93250 * 10 44 45.0270200315 -59 33 54.681395850 6.73 8.12 7.50 8.38   O4III(fc) 294 0
34 Cl Trumpler 16 OpC 10 45 10 -59 43.0   5.35 5.0     ~ 432 0
35 HD 93343 * 10 45 12.2207664009 -59 45 00.439825726 9.01 9.76 9.558 9.17 8.76 O8Vz 74 0
36 V* V731 Car Al* 10 45 12.7216788300 -59 44 46.148146531 8.739 9.472 9.229 9.65 8.699 O8V(n)+O9.5V 80 0
37 Ass Car OB 2 As* 11 08 -60.2           ~ 76 0
38 NAME NGC 3576 IRS 1 HII 11 11 54.8 -61 18 26           ~ 30 1
39 HD 102152 * 11 45 05.6821196326 -61 31 02.286156401   9.16 9.15     A0V 12 0
40 IRAS 12073-6233 mul 12 10 00.4 -62 49 57           ~ 48 0
41 [GS70] 298.2-00.3 HII 12 10 01.886 -62 50 00.46           ~ 65 1
42 HD 110062 * 12 40 08.6012958688 -63 27 12.113133000   9.19 8.96     B9V 13 0
43 HD 137251 * 15 27 15.9489433458 -54 18 51.648557354   8.82 8.67     A2Vn 5 0
44 [DBS2003] 95 HII 15 44 42.8 -54 05 56           ~ 54 0
45 IRAS 15411-5352 HII 15 44 59.448 -54 02 13.92           ~ 33 2
46 IRAS 15502-5302 HII 15 54 07.2 -53 11 20           ~ 44 0
47 MSX6C G332.1544-00.4487 HII 16 16 40.776 -51 17 06.36           ~ 35 1
48 [BKH2005] 16164nr3636 * 16 20 11.31 -50 53 25.3           O 2 0
49 IRAS 16164-5046 HII 16 20 14.1 -50 53 20           ~ 27 0
50 IRAS 16177-5018 HII 16 21 31.4 -50 25 04           ~ 31 0
51 * 36 Her * 16 40 35.1505728617 +04 12 25.927818306   7.06 6.93     B9V 63 0
52 HD 150628 * 16 44 45.5665157062 -50 35 39.817877755   9.37 9.12     A0V 3 0
53 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 195 0
54 2MASS J16540508-4150069 Y*? 16 54 05.0795155173 -41 50 06.929072580 8.924 9.575 9.457   9.201 B1V 41 0
55 2MASS J16540671-4150070 Y*? 16 54 06.7112229755 -41 50 07.109910930 8.903 9.541 9.421   9.161 B1V 31 0
56 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 487 0
57 2MASS J16541410-4150084 Y*? 16 54 14.1033506706 -41 50 08.508078355 8.141 8.884 8.756   8.460 ~ 51 0
58 V* V964 Sco bC* 16 54 18.3198070659 -41 51 35.656007460 9.126 9.776 9.603 9.61 9.290 B0.5V 52 0
59 [DBS2003] 113 Cl* 17 00 35.5 -40 33 31           ~ 32 0
60 GM 1-24 HII 17 17 04.0 -36 21 14           ~ 48 0
61 SH 2-4 HII 17 18 23.9 -39 19 10           ~ 82 4
62 [BKH2005] 17149nr895 * 17 18 25.454 -39 19 08.61           ~ 3 0
63 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 209 1
64 IRAS 17258-3637 HII 17 29 16.7 -36 40 13           ~ 54 0
65 HD 158684 * 17 32 30.0944725061 -41 18 14.038246687   8.93 8.77     A0V 3 0
66 [GMC2001] 17-59 Mi* 17 45 29.695 -28 56 11.35           ~ 19 0
67 HD 161759 * 17 48 59.8647771214 -37 17 42.793246530   8.94 8.87     A0V 8 0
68 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 302 0
69 M 8 HII 18 03 37 -24 23.2           ~ 559 1
70 IRAS 18006-2422 HII 18 03 45.7 -24 22 41           ~ 22 0
71 GAL 010.30-00.15 HII 18 08 58.315 -20 05 15.27           ~ 80 0
72 W 31 SFR 18 10 28.6 -19 55 51           ~ 241 0
73 HD 166131 * 18 10 29.9628571733 -29 54 24.490653515   9.35 9.30     B8V 7 0
74 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1494 0
75 HD 171572 * 18 36 41.7341281375 -24 03 47.076180516   9.68 9.50     B9V 7 0
76 HD 171808 * 18 37 37.7220149313 -20 03 59.859995908   9.93 9.54     A0V 4 0
77 GAL 029.9-00.0 HII 18 46 08.0 -02 40 41           ~ 33 0
78 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 448 0
79 IRAS 18449-0158 HII 18 47 35.6 -01 55 26           ~ 24 0
80 2MASS J18473666-0156334 ** 18 47 36.670 -01 56 33.46           WN7 24 0
81 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 468 0
82 GAL 035.20-01.74 Y*O 19 01 47.0 +01 13 08           ~ 72 1
83 IRAS 19078+0901 HII 19 10 15.6 +09 06 05           ~ 32 0
84 W 49a SFR 19 10 15.7 +09 06 05           ~ 261 2
85 NAME W 49A South HII 19 10 21.6 +09 05 03           ~ 51 2
86 Caswell OH 045.12+00.13 HII 19 13 27.845 +10 53 36.74           ~ 113 0
87 HD 181690 * 19 21 24.4957520965 +00 05 20.646701512   9.18 9.05     B5/7III 7 0
88 HD 186549 * 19 44 47.7305201358 +10 12 15.460792271   10.09 9.94     B9V 3 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-23:11:42

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