Radio continuum, IR and CCD images of selected regions in NGC 6357

Details Radio continuum, IR and CCD images of selected regions in NGC 6357 Radio continuum, IR and CCD images of selected regions in NGC 6357

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..477f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 2, June 1990, p. 477-494.

Astronomy and Astrophysics

Astronomy

15

Charge Coupled Devices, H Ii Regions, Infrared Imagery, Radio Astronomy, Stellar Evolution, Early Stars, Far Infrared Radiation, Infrared Astronomy Satellite, Radio Emission, Very Large Array (Vla)

Scientific paper

The H II region and star-formation complex NGC 6357 is characterized on the basis of (1) a 25-micron IRAS map; (2) 6-cm VLA observations; (3) optical images obtained with the 0.9-m telescope at CTIO; (4) NIR photometry obtained with the 2.2-m telescope at ESO; and (5) CCD images obtained in the J, H, K, L-prime, H-alpha, and I bands with the 1.5-m telescope at CTIO. The data are presented in extensive tables, graphs, and images and discussed in detail. A clearly delineated ionization front bounded by a dark obscuring lane is seen in the optical/IR/radio-bright component G 353.2 + 0.9, and the early-type stars in the cluster Pis 24 are shown to lie outside the ionization front, so that they cannot be the source of ionization for the region as previously assumed. Component G 353.1 + 0.6 is found to be a nearly classical Stromgren sphere of very-low-density gas with a central early-type star as its ionization source.

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