2000ApJ...539..283B

Query : 2000ApJ...539..283B

2000ApJ...539..283B - Astrophys. J., 539, 283-299 (2000/August-2)

The H II region KR 140: spontaneous formation of a high-mass star.

BALLANTYNE D.R., KERTON C.R. and MARTIN P.G.

Abstract (from CDS):

We have used a multiwavelength data set from the Canadian Galactic Plane Survey (CGPS) to study the Galactic H II region KR 140, both on the scale of the nebula itself and in the context of the star-forming activity in the nearby W3/W4/W5 complex of molecular clouds and H II regions. From both radio and infrared data we have found a covering factor of about 0.5 for KR 140, and we interpret the nebula as a bowl-shaped region viewed close to face on. Extinction measurements place the region on the near side of its parent molecular cloud. The nebula is kept ionized by one O8.5 V(e) star, VES 735, which is less than a few million years old. CO data show that VES 735 has disrupted much of the original molecular cloud for which the estimated mass and density are about 5000 M☉ and 100 cm–3, respectively. KR 140 is isolated from the nearest star-forming activity, in W3. Our data suggest that KR 140 is an example of spontaneous (i.e., nontriggered) formation of, unusually, a high-mass star.

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Journal keyword(s): ISM: H II Regions - Infrared: ISM: Continuum - ISM: individual (KR 140) - radio continuum: ISM - Radio Lines: ISM - Stars: Formation

Simbad objects: 25

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Number of rows : 25
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 SNR G132.6+01.5 SNR 02 17 40 +62 45.0           ~ 193 0
2 IRAS 02156+6045 IR 02 19 21.2 +60 59 45           ~ 4 0
3 IRAS 02157+6053 IR 02 19 24.6 +61 07 15           ~ 7 0
4 BIRS 132 IR 02 19 33.86 +61 01 10.3           ~ 4 0
5 BIRS 131 IR 02 19 33.93 +61 01 32.0           ~ 4 0
6 IRAS 02160+6057 IR 02 19 47.3 +61 11 24           ~ 9 0
7 RRF 1343 HII 02 20 05.6 +61 07 04           ~ 38 1
8 BIRS 130 IR 02 20 07.00 +61 09 08.1           ~ 4 0
9 EM* VES 735 Em* 02 20 07.1692298232 +61 07 05.534680512           O8.5V 20 0
10 BIRS 129 IR 02 20 10.31 +61 10 01.2           ~ 4 0
11 IRAS 02168+6052 IR 02 20 31.46 +61 05 36.6           ~ 5 0
12 BIRS 128 IR 02 20 41.45 +61 06 02.0           ~ 4 0
13 KMJB 3 Y*O 02 20 51.384 +61 12 02.64           ~ 11 0
14 IRAS 02171+6058 mul 02 20 51.4 +61 12 01           ~ 11 0
15 KMJB 1 Y*O 02 21 08.52 +61 05 58.2           ~ 7 0
16 IRAS 02174+6052 mul 02 21 08.5 +61 06 00           ~ 8 0
17 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
18 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
19 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
20 NAME W3/W4/W5 Region SFR 02 40.0 +61 00           ~ 34 0
21 IC 1848 OpC 02 51 19.4 +60 25 32   6.87 6.5     ~ 522 2
22 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
23 Ass Gem OB 1 As* 06 09.8 +21 35           ~ 203 0
24 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 522 1
25 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1

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