2012A&A...540A..89W


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.12CET10:41:30

2012A&A...540A..89W - Astronomy and Astrophysics, volume 540A, 89-89 (2012/4-1)

Probing the envelopes of massive young stellar objects with diffraction limited mid-infrared imaging.

WHEELWRIGHT H.E., DE WIT W.J., OUDMAIJER R.D., HOARE M.G., LUMSDEN S.L., FUJIYOSHI T. and CLOSE J.L.

Abstract (from CDS):

Massive stars form whilst they are still embedded in dense envelopes. As a result, the roles of rotation, mass loss and accretion in massive star formation are not well understood. This study evaluates the source of the Q-band, λc=19.5µm, emission of massive young stellar objects (MYSOs). This allows us to determine the relative importance of rotation and outflow activity in shaping the circumstellar environments of MYSOs on 1000AU scales. We obtained diffraction limited mid-infrared images of a sample of 20 MYSOs using the VLT/VISIR and Subaru/COMICS instruments. For these 8m class telescopes and the sample selected, the diffraction limit, ∼0.6'', corresponds to approximately 1000AU. We compare the images and the spectral energy distributions (SEDs) observed to a 2D, axis-symmetric dust radiative transfer model that reproduces VLTI/MIDI observations of the MYSO W33A. We vary the inclination, mass infall rate, and outflow opening angle to simultaneously recreate the behaviour of the sample of MYSOs in the spatial and spectral domains. The mid-IR emission of 70 percent of the MYSOs is spatially resolved. In the majority of cases, the spatial extent of their emission and their SEDs can be reproduced by the W33A model featuring an in-falling, rotating dusty envelope with outflow cavities. There is independent evidence that most of the sources which are not fit by the model are associated with ultracompactHII regions and are thus more evolved. We find that, in general, the diverse ∼20µm morphology of MYSOs can be attributed to warm dust in the walls of outflow cavities seen at different inclinations. This implies that the warm dust in the outflow cavity walls dominates the Q-band emission of MYSOs. In turn, this emphasises that outflows are an ubiquitous feature of massive star formation.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: imaging - stars: early-type - stars: winds, outflows - infrared: stars - ISM: jets and outflows

Simbad objects: 29

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Number of rows : 29

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IRAS 08448-4343 cor 08 46 33.8 -43 54 33           ~ 56 1
2 2MASS J08484863-4332290 Y*O 08 48 48.64 -43 32 29.1           ~ 7 0
3 MSX6C G265.1438+01.4548 IR 08 59 27.5 -43 45 07           ~ 3 0
4 IRAS 09017-4716 Y*? 09 03 25.0188145205 -47 28 27.884269453           ~ 10 0
5 MSX6C G269.1586-01.1383 IR 09 03 32.1 -48 28 43           ~ 2 0
6 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 401 0
7 * gam Cru PM* 12 31 09.95961 -57 06 47.5684 5.01 3.23 1.64 -0.02 -1.44 M3.5III 260 0
8 2MASS J13513785-6139075 Y*O 13 51 37.856 -61 39 07.52           ~ 37 0
9 * tet Cen PM* 14 06 40.94752 -36 22 11.8371 3.94 3.04 2.05 1.29 0.76 K0-IIIb 234 0
10 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2095 0
11 MSX6C G314.3197+00.1125 Y*O 14 26 26.112 -60 38 29.76           ~ 3 0
12 IRAS 14498-5856 HII 14 53 42.324 -59 08 57.44           ~ 19 0
13 RAFGL 4972S Y*O 15 00 55.680 -58 58 54.84           ~ 32 0
14 2MASS J15431897-5407356 Y*O 15 43 18.97 -54 07 35.6           ~ 7 0
15 2MASS J16054183-4911294 Y*? 16 05 41.84 -49 11 29.5           ~ 12 0
16 MSX6C G332.9868-00.4871 IR 16 20 37.9 -50 43 49           ~ 2 0
17 MSX6C G333.1075-00.5020 IR 16 21 14.3 -50 39 21           ~ 2 0
18 MSX6C G339.6221-00.1209 Y*O 16 46 06.168 -45 36 44.28           ~ 4 0
19 * alf TrA * 16 48 39.89508 -69 01 39.7626   3.36 1.92     K2III_Ba1 227 0
20 MSX6C G341.1281-00.3466 Y*O 16 52 33.8 -44 36 09           ~ 3 0
21 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 46 0
22 MSX6C G343.5024-00.0145 IR 16 59 20.7759662638 -42 32 37.751026109           ~ 6 0
23 MSX6C G343.5213-00.5171 Y*O 17 01 33.984 -42 50 19.68           ~ 2 0
24 MSX6C G349.7215+00.1203 IR 17 18 11.4 -37 28 25           ~ 1 0
25 HD 163376 V* 17 57 47.8033772 -41 42 58.661213   6.503 4.863     M0III 42 0
26 W 33a Y*O 18 14 39.0 -17 52 03           ~ 570 0
27 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 89 0
28 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 388 0
29 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 189 0

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2019.11.12-10:41:30

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