2009A&A...508..759C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET22:55:34

2009A&A...508..759C - Astronomy and Astrophysics, volume 508, 759-771 (2009/12-3)

Unveiling the molecular environment of the ring nebula RCW78.

CAPPA C.E., RUBIO M., MARTIN M.C. and ROMERO G.A.

Abstract (from CDS):

We present a study of the ionized, neutral atomic, and molecular gas associated with the ring nebula RCW78 around the WR star HD117688 (=WR55) with the aim of analyzing the distribution of the associated gas and investigating its energetics. We base our study on 12CO(1-0) and 12CO(2-1) observations of the brightest section of the nebula carried out with the SEST telescope with angular resolutions of 45" and 22", respectively; and on complementary 12CO(1-0) data of a larger area obtained with the NANTEN telescope with an angular resolution of 2.7', HI 21-cm line data taken from the ATCA survey, IRAS HIRES data, and radio continuum data at 4.85 GHz from the Parkes survey. We report the detection of molecular gas having velocities in the range -56 to -33km/s associated with the western region of RCW78. A few patches of molecular gas possibly linked to the eastern faint section are detected. The CO emission appears concentrated in a region of 23'x18' in size, with a total molecular mass of (1.3±0.5)x105M, mainly connected to the western section. The analysis of the neutral atomic gas distribution reveals the HI envelope of the molecular cloud, while the radio continuum emission shows a ring-like structure, which is the radio counterpart of the optical nebula. The gas distribution is compatible with the western section of RCW78 having originated in the photodissociation and ionization of the molecular gas by the UV photons of the WN7 star HD117688, and with the action of the stellar winds of the WR star on the surrounding gas. In this scenario, the interstellar bubble expanded more easily towards the east than towards the west due to the lack of dense molecular gas in the eastern section. The proposed scenario also explains the off center location of WR55. A number of infrared point sources classified as YSO candidates showed that star formation activity is present in the molecular gas linked to the nebula. The possibility that the expansion of the bubble triggered star formation in this region cannot be discarded.

Abstract Copyright:

Journal keyword(s): ISM: bubbles - ISM: individual objects: RCW78 - stars: Wolf-Rayet - stars: individual: WR55

Nomenclature: Fig. 9: [CRM2009] A (Nos A-C).

Simbad objects: 32

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Number of rows : 32

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 Ori A MoC 05 38 -07.1           ~ 2739 0
2 GUM 48b HII 13 33.3 -62 18           ~ 2 0
3 [CRM2009] A FIR 13 33 20 -62 17.0           ~ 1 0
4 HD 117688 WR* 13 33 30.1195029290 -62 19 01.211515819 8.69 10.81 10.90 10.44   WN7 122 0
5 RCW 78 HII 13 33.9 -62 15           ~ 25 0
6 MSX6C G307.8561+00.0463 IR 13 34 10.2 -62 24 58           ~ 2 0
7 IRAS 13307-6211 FIR 13 34 11.6 -62 27 01           ~ 3 0
8 HD 117797 * 13 34 11.9819702069 -62 25 01.783079406 9.13 9.68 9.20 9.56   O7.5fp 52 0
9 MSX6C G307.8603+00.0439 IR 13 34 12.6 -62 25 04           ~ 2 0
10 MSX6C G307.8620+00.0399 IR 13 34 13.8 -62 25 18           ~ 2 0
11 2MASS J13341444-6226350 IR 13 34 14.44 -62 26 35.0           ~ 1 0
12 [CRM2009] B FIR 13 34 15 -62 26.0           ~ 2 0
13 SSTGLMC G307.8680+00.0277 IR 13 34 17.9136 -62 25 57.036           ~ 1 0
14 SSTGLMC G307.8721+00.0345 IR 13 34 19.4304 -62 25 30.360           ~ 1 0
15 2MASS J13342157-6226418 IR 13 34 21.57 -62 26 41.8           ~ 1 0
16 C 1331-622 OpC 13 34 37 -62 25.0           ~ 12 0
17 2MASS J13344768-6226570 IR 13 34 47.69 -62 26 57.1           ~ 1 0
18 2MASS J13344891-6225294 IR 13 34 48.91 -62 25 29.5           ~ 1 0
19 2MASS J13345010-6225418 IR 13 34 50.11 -62 25 41.8           ~ 1 0
20 2MASS J13345406-6226169 IR 13 34 54.06 -62 26 17.0           ~ 1 0
21 2MASS J13345484-6225226 IR 13 34 54.84 -62 25 22.6           ~ 1 0
22 SSTGLMC G307.9422+00.0185 IR 13 34 56.6544 -62 25 45.228           ~ 1 0
23 2MASS J13345865-6226365 IR 13 34 58.6544504484 -62 26 36.647101750           ~ 1 0
24 2MASS J13350066-6225386 IR 13 35 00.66 -62 25 38.6           ~ 1 0
25 2MASS J13350087-6226039 IR 13 35 00.87 -62 26 03.9           ~ 1 0
26 MSX6C G307.9563+00.0163 IR 13 35 04.0 -62 25 45           ~ 1 0
27 IRAS 13316-6210 IR 13 35 04.21 -62 25 19.2           ~ 6 0
28 2MASS J13350470-6225101 IR 13 35 04.70 -62 25 10.2           ~ 1 0
29 SSTGLMC G307.9621+00.0383 IR 13 35 05.0928 -62 24 22.932           ~ 1 0
30 SSTGLMC G307.9577+00.0078 IR 13 35 05.5032 -62 26 13.812           ~ 1 0
31 2MASS J13350800-6225394 IR 13 35 08.01 -62 25 39.4           ~ 1 0
32 [CRM2009] C FIR 13 35 10 -62 26.0           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-22:55:34

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