2001AJ....121.2089O

Query : 2001AJ....121.2089O

2001AJ....121.2089O - Astron. J., 121, 2089-2094 (2001/April-0)

Near-infrared spectroscopy of the compact H II region W51 IRS 2.

OKUMURA S.-I., MORI A., WATANABE E., NISHIHARA E. and YAMASHITA T.

Abstract (from CDS):

Medium-resolution (R∼460) spectra in the K window have been obtained for the compact H II regions W51 IRS 2 East and IRS 2 West. Brγ, He I, three lines of [Fe III], and seven lines of molecular hydrogen (H2) have been detected. The unidentified line at 2.288 µm was also detected with ∼2% of the intensity of Brγ. We derive an electron density of ∼105-106 cm–3 in both IRS 2 East and IRS 2 West from [Fe III] line ratios. In both regions, observed H2 line ratios indicate that the excitation of H2 is dominated by fluorescence rather than by shocks.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - Infrared Radiation - ISM: Lines and Bands - Stars: Formation

Simbad objects: 15

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Number of rows : 15
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 Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
2 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
3 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
4 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 657 1
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
7 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
8 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
9 Caswell OH 045.12+00.13 HII 19 13 27.85 +10 53 36.7           ~ 121 0
10 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
11 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
12 HD 182761 * 19 25 22.3915776720 +20 16 18.216714108   6.278 6.287     A0V 67 0
13 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
14 HD 203856 * 21 23 35.5297279464 +40 01 07.023676800   7.33 7.21     A0V 85 0
15 PN Hb 12 PN 23 26 14.8236376464 +58 10 54.543292356   13.51 11.49 12.44   Oe 338 0

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