2007MNRAS.380..246G

Query : 2007MNRAS.380..246G

2007MNRAS.380..246G - Mon. Not. R. Astron. Soc., 380, 246-262 (2007/September-1)

A high-frequency radio continuum study of massive young stellar objects.

GIBB A.G. and HOARE M.G.

Abstract (from CDS):

We present high-resolution observations made with the Very Large Array (VLA) in its A configuration at frequencies between 5 and 43 GHz of a sample of five massive young stellar objects (YSOs): LkHα101, NGC2024-IRS2, S106-IR, W75N and S140-IRS1. The resolution varied from 0.04 arcsec (at 43 GHz) to 0.5 arcsec (at 5 GHz), corresponding to a linear resolution as high as 17 au for our nearest source. A MERLIN observation of S106-IR at 23 GHz with 0.03-arcsec resolution is also presented. S106-IR and S140-IRS1 are elongated at 43 GHz perpendicular to their large-scale bipolar outflows. This confirms the equatorial wind picture for these sources seen previously in MERLIN 5-GHz observations. The other sources are marginally resolved at 43 GHz. The spectral indices we derive for the sources in our sample range from +0.2 to +0.8, generally consistent with ionized stellar winds. We have modelled our sources as uniform, isothermal spherical winds, with LkHα101 and NGC2024-IRS2 yielding the best fits. However, in all cases our fits give wind temperatures of only 2000-5000K, much less than the effective temperatures of main-sequence stars of the same luminosity, a result which is likely due to the clumpy nature of the winds.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): stars: early-type - stars: formation - stars: winds, outflows - radio continuum: stars

Simbad objects: 34

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Number of rows : 34
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 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 367 0
2 W 3(H2O) Mas 02 27 04.6 +61 52 25           ~ 154 0
3 RAFGL 490 Or* 03 27 38.7928952784 +58 47 00.025298088           ~ 359 0
4 6C 035545+504923 Bla 03 59 29.74727351 +50 57 50.1618607           ~ 480 1
5 NGC 1579 OpC 04 30 03.4 +35 19 30           ~ 92 1
6 EM* LkHA 101 Em* 04 30 14.4355820328 +35 16 23.983198932   17.91 15.71 13.33   F 376 1
7 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 113 0
8 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
9 [BCB89] IRS 2b Y*O 05 41 45.490 -01 54 28.78           O8V 57 1
10 CXOU J054145.5-015427 Y*O 05 41 45.518 -01 54 27.03           ~ 7 0
11 [BCB89] IRS 2 Y*O 05 41 45.81 -01 54 29.8           B 105 0
12 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
13 [VM2005] W33A Q1 mm 18 14 39.46 -17 52 00.5           ~ 20 0
14 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
15 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 236 0
16 RAFGL 2136 Y*O 18 22 26.52888 -13 30 14.0400           ~ 300 0
17 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 138 0
18 NAME SH 2-106 FIR IR 20 27 25.4 +37 22 48           ~ 49 0
19 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 168 1
20 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 640 0
21 EM* MWC 349A Or* 20 32 45.5291969760 +40 39 36.651807828           ~ 180 0
22 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
23 [HRB81] W75N(Ba) HII 20 38 36.445 +42 37 34.82           ~ 55 0
24 [TGR97] VLA 2 HII 20 38 36.482 +42 37 34.08           ~ 63 0
25 [HRB81] W75N(Bb) HII 20 38 36.486 +42 37 33.44           ~ 38 0
26 [HRB81] W75N(Bc) Rad 20 38 36.533 +42 37 32.04           ~ 10 0
27 [MWW95] S140-SMM 1 smm 22 19 16.7 +63 18 42           ~ 15 0
28 [BBW79] S 140 IRS 4 Rad 22 19 17.53 +63 18 41.1           ~ 12 1
29 NAME SH 2-140 IRS 1 Y*O 22 19 18.277 +63 18 45.82           ~ 201 0
30 NAME SH 2-140 IRS 2 NIR 22 19 18.514 +63 18 55.16           ~ 35 0
31 NAME SH 2-140 IRS 3 NIR 22 19 19.853 +63 18 48.07           ~ 47 0
32 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 243 0
33 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3
34 IRAS 23118+6110 Y*O 23 14 02.09473 +61 27 18.8460           ~ 385 0

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