1999A&A...346..243F


Query : 1999A&A...346..243F

1999A&A...346..243F - Astronomy and Astrophysics, volume 346, 243-259 (1999/6-1)

High-resolution imaging of ultracompact HII regions. II. G5.89-0.39 revisited.

FELDT M., STECKLUM B., HENNING T., LAUNHARDT R. and HAYWARD T.L.

Abstract (from CDS):

We present the results of an extensive imaging campaign on the ultracompact HII region G5.89-0.39 at near- and mid-infrared wavelengths. High-resolution data were taken in the H, K', and L bands using ESO's adaptive optics system ADONIS. They are complemented by conventional narrow-band images in Brγ and H2(1-0)S1 as well as by mid-infrared broad- and narrow-band images. We also mapped the 1.3mm continuum emission from the source using the SEST. We use our data to consistently explain the morphological appearance of G5.89-0.39 at all observed wavelengths as well as its spectral energy distribution. The complete model of the source consists of a spherical shell of dust with an inner, dust-free cavity of 7.6x1016cm radius surrounding a star of spectral type O6 ZAMS. Two outflows escape this shell in opposite directions. Half of the whole configuration is evidently obscured by a very massive cloud of cold dust. Comparisons with earlier models and other ultracompact HII regions are drawn to put G5.89-0.39 in the context of massive star formation.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: early-type - ISM: HII regions - methods: observational

Nomenclature: :Fig.6: [FSH99] H2 A (Nos A-C). Fig.11, Table 3: [FSH99] NN (Nos 0-21).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 319 0
2 * eta Sgr LP? 18 17 37.6350518 -36 45 42.066723 6.37 4.67 3.11 1.55 0.23 M2III 139 0
3 HD 169588 * 18 26 49.7670214536 -35 22 10.357746600   8.82 8.82     A0 8 0
4 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2591 0
5 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 138 0
6 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 152 1
7 [FSH99] H2 A reg ~ ~           ~ 2 0
8 [FSH99] H2 C reg ~ ~           ~ 2 0
9 [FSH99] H2 B reg ~ ~           ~ 3 0

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2022.05.26-03:40:00

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