2009A&A...494..987P

Query : 2009A&A...494..987P

2009A&A...494..987P - Astronomy and Astrophysics, volume 494, 987-1003 (2009/2-2)

Triggered star formation on the borders of the Galactic HII region RCW 82.

POMARES M., ZAVAGNO A., DEHARVENG L., CUNNINGHAM M., JONES P., KURTZ S., RUSSEIL D., CAPLAN J. and COMERON F.

Abstract (from CDS):

We are engaged in a multi-wavelength study of several Galactic HII regions that exhibit signposts of triggered star formation on their borders, where the collect and collapse process could be at work. When addressing the question of triggered star formation, it is critical to ensure the real association between the ionized gas and the neutral material observed nearby. In this paper we stress this point and present CO observations of the RCW 82 star forming region. The velocity distribution of the molecular gas is combined with the study of young stellar objects (YSOs) detected in the direction of RCW 82. We discuss the YSO's evolutionary status using near- and mid-IR data. The spatial and velocity distributions of the molecular gas are used to discuss the possible scenarios for the star formation around RCW 82. Several massive molecular condensations, together with star formation sites, are observed on the borders of RCW 82. The shapes of the three brightest condensations suggest that they were pre-existent, i.e. not formed through the collect and collapse process. A thin layer of molecular material is observed surrounding the ionized gas, adjacent to the ionization front. This results from the sweeping up of neutral material around the expanding region. Several Class I YSOs are detected in the direction of this layer. The numerous YSOs observed towards the bright molecular condensations bordering (and velocity-associated with) the ionized gas reveal the intense star formation activity in RCW 82. But this region is probably too young to have triggered star formation via the collect and collapse process.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: early-type - ISM: Hii regions - ISM: individual objects: RCW 82

Nomenclature: Table 1, Fig.12: [PZD2009] Condensation Na (Nos 1-8, 1a, 1b), [PZD2009] Condensation N-core (Nos 2-core, 8-core). Table 2, text: [PZD2009] Star NNN N=19+5 among (Nos 7-107), [PZD2009] Star AN N=14, [PZD2009] Star eN (Nos e1-e4). Paragr. 4.3.2: [PZD2009] JHHMMSS.s+DDMMSS.s N=1.

CDS comments: Paragraph 3.2 source G331.0341+00.3791 is a misprint for MSX6C G311.0341+00.3791.

Simbad objects: 64

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Number of rows : 64
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 SH 2-212 HII 04 40 37.8 +50 27 40           ~ 99 2
2 LBN 159.17+03.33 HII 04 58 45.70 +47 59 36.0           ~ 82 2
3 SH 2-241 HII 06 04.1 +30 15           ~ 57 1
4 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 101 0
5 [PZD2009] Condensation 4 MoC 13 58 57.150 -61 18 45.22           ~ 1 0
6 2MASS J13585780-6122257 * 13 58 57.807 -61 22 25.70           ~ 1 0
7 [PZD2009] Condensation 6 MoC 13 58 58.780 -61 21 56.65           ~ 1 0
8 2MASS J13590129-6122599 Y*O 13 59 01.294 -61 22 59.97           ~ 1 0
9 IRAS 13555-6107 LP? 13 59 03.6093957480 -61 22 16.244853744           ~ 3 0
10 [PZD2009] Star 106 Y*O 13 59 05.3 -61 22 26           ~ 1 0
11 [PZD2009] Condensation 7 MoC 13 59 05.360 -61 22 54.91           ~ 1 0
12 2MASS J13590693-6124565 Y*O 13 59 06.9486485112 -61 24 56.543732532           ~ 1 0
13 [PZD2009] Condensation 5 MoC 13 59 10.390 -61 20 30.95           ~ 1 0
14 2MASS J13591733-6125509 * 13 59 17.338 -61 25 50.93           ~ 1 0
15 RCW 82 HII 13 59.3 -61 27           ~ 30 0
16 [CPA2006] S137 bub 13 59 26.70 -61 23 36.7           ~ 7 0
17 2MASS J13592742-6123194 * 13 59 27.43 -61 23 19.5           ~ 2 0
18 2MASS J13592814-6122592 * 13 59 28.1533006080 -61 22 59.207995704         11.04 ~ 3 0
19 TYC 9004-2395-1 * 13 59 29.2026485568 -61 23 03.119388720   11.96 11.39     ~ 3 0
20 WRAY 15-1157 Em* 13 59 29.9442041304 -61 23 07.666424232       13.854 11.73 ~ 3 0
21 [PZD2009] Condensation 1b MoC 13 59 30.400 -61 19 55.00           ~ 1 0
22 2MASS J13593192-6120374 Y*O 13 59 31.929 -61 20 37.47           ~ 1 0
23 2MASS J13593474-6119224 Y*O 13 59 34.745 -61 19 22.49           ~ 2 0
24 2MASS J13593676-6120484 Y*O 13 59 36.77 -61 20 48.4           ~ 2 0
25 [PZD2009] Condensation 1 MoC 13 59 36.86 -61 19 14.5           ~ 1 0
26 [PZD2009] Condensation 1a MoC 13 59 37.080 -61 20 18.97           ~ 1 0
27 2MASS J13594433-6122438 * 13 59 44.3357496720 -61 22 43.846645152           ~ 1 0
28 2MASS J13594481-6122453 * 13 59 44.8169704968 -61 22 45.229598652           ~ 1 0
29 2MASS J13594494-6122566 * 13 59 44.95 -61 22 56.7           ~ 1 0
30 [PZD2009] Star D3 * 13 59 45.11 -61 22 46.1           ~ 1 0
31 2MASS J13594684-6122093 * 13 59 46.8438715872 -61 22 09.264904716           ~ 1 0
32 [PZD2009] Condensation 3 MoC 13 59 47.140 -61 25 18.90           ~ 1 0
33 [PZD2009] Condensation 2-core MoC 13 59 47.140 -61 22 30.84           ~ 1 0
34 2MASS J13594736-6122017 Y*? 13 59 47.362 -61 22 01.74           ~ 3 0
35 2MASS J13594839-6124203 * 13 59 48.40 -61 24 20.3           ~ 1 0
36 [PZD2009] Star N3 * 13 59 48.89 -61 23 03.4           ~ 1 0
37 [PZD2009] Star O3 * 13 59 49.380 -61 23 04.01           ~ 1 0
38 [PZD2009] Star 35 * 13 59 50.890 -61 25 22.23           ~ 2 0
39 [PZD2009] Star E2 * 13 59 56.43 -61 24 29.2           ~ 1 0
40 [PZD2009] Star F2 * 13 59 56.88 -61 24 41.2           ~ 1 0
41 [PZD2009] J135957.4-612432.9 Cl* 13 59 57.0 -61 24 32           ~ 1 0
42 [PZD2009] Star C2 * 13 59 57.12 -61 24 34.4           ~ 1 0
43 [PZD2009] Star A2 * 13 59 57.40 -61 24 37.2           ~ 1 0
44 2MASS J13595749-6124293 Y*O 13 59 57.49 -61 24 29.4           ~ 1 0
45 2MASS J13595761-6124368 * 13 59 57.61 -61 24 36.9           ~ 3 0
46 [PZD2009] Star L2 * 13 59 57.890 -61 24 25.46           ~ 1 0
47 [PZD2009] Condensation 2 MoC 13 59 57.96 -61 22 17.3           ~ 1 0
48 [PZD2009] Star M2 * 13 59 58.130 -61 24 27.07           ~ 1 0
49 [PZD2009] Star 36 * 13 59 58.140 -61 24 10.27           ~ 1 0
50 2MASS J13595917-6123434 * 13 59 59.18 -61 23 43.5           ~ 1 0
51 [PZD2009] Condensation 8-core MoC 13 59 59.61 -61 24 19.1           ~ 1 0
52 2MASS J13595995-6124221 * 13 59 59.96 -61 24 22.1           ~ 1 0
53 2MASS J14000166-6121548 Y*O 14 00 01.667 -61 21 54.84           ~ 1 0
54 2MASS J14000171-6124514 * 14 00 01.7294950560 -61 24 51.490310508           ~ 1 0
55 [PZD2009] Condensation 8 MoC 14 00 01.75 -61 24 01.1           ~ 1 0
56 IRAS 13566-6106 Y*O 14 00 12.616 -61 20 13.36           ~ 2 0
57 SH 2-3 HII 17 12.4 -38 28           ~ 205 1
58 [L89b] 28.823-00.226 bub 18 44 44.3 -03 45 34           ~ 77 0
59 SH 2-104 HII 20 17 52.5 +36 49 24           ~ 97 0
60 [PZD2009] Star 103 * ~ ~           ~ 1 0
61 [PZD2009] Star 34 Y*O ~ ~           ~ 1 0
62 [PZD2009] Star 101 * ~ ~           ~ 1 0
63 [PZD2009] Star 100 * ~ ~           ~ 1 0
64 [PZD2009] Star 48 * ~ ~           ~ 1 0

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