2004A&A...417..981H


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET21:47:35

2004A&A...417..981H - Astronomy and Astrophysics, volume 417, 981-985 (2004/4-3)

Peering into the heart of a high-mass star forming region: Bispectrum speckle interferometry of the ultracompact H II region K3-50A.

HOFMANN K.-H., BALEGA Y.Y., PREIBISCH T. and WEIGELT G.

Abstract (from CDS):

We present K'-band bispectrum speckle interferometry of the ultracompact H II region K3-50A. Our image resolves the central 1''x1'' region into at least 7 point-like objects. We find K'-band counterparts for all but one of the N-band sources discovered by Okamoto et al. (2003ApJ...584..368O), and there are additional K'-band sources which were unresolved in the N-band images. Our reconstructed image also reveals the fine-structure of the cone-shaped nebulosity extending to the south. The brightest K'-band source is located exactly at the tip of the cone-shaped nebulosity. The nebula shows several arcs and the orientation of its main axis agrees very well with the direction of the CO outflow from K3-50A. This nebulosity therefore very likely represents the clumpy inner surface of a partially evacuated cavity excavated by the strong outflows.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - stars: formation - stars: pre-main sequence - H II regions: individual: G70.293+1.600

Simbad objects: 8

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Number of rows : 8

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 K 3-50A HII 20 01 45.6 +33 32 42           ~ 75 0
2 OKYM K3-50A2 IR 20 01 45.62 +33 32 43.1           ~ 3 0
3 OKYM K3-50A3 * 20 01 45.62 +33 32 43.5           ~ 4 0
4 OKYM K3-50A1 IR 20 01 45.66 +33 32 43.0           ~ 3 0
5 OKYM K3-50A4 IR 20 01 45.74 +33 32 42.2           ~ 4 0
6 [KC97c] G070.3+01.6 HII 20 01 46.8 +33 33 05           ~ 9 0
7 NGC 6857 HII 20 01 47.75 +33 31 38.2           ~ 85 3
8 STHO K3-50A 1 IR ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-21:47:35

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