Mid-Infrared Ionic Line Observations of Ultracompact HII Regions: Ionization by Massive Star Clusters

Details Mid-Infrared Ionic Line Observations of Ultracompact HII Regions: Ionization by Massive Star Clusters Mid-Infrared Ionic Line Observations of Ultracompact HII Regions: Ionization by Massive Star Clusters

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..267..399o&link_type=abstract

Hot Star Workshop III: The Earliest Stages of Massive Star Birth. ASP Conference Proceedings, Vol. 267. Edited by Paul A. Crowth

Astronomy and Astrophysics

Astronomy

Scientific paper

The ionizing star masses of ultracompact (UC) HII regions, W51 IRS2 and K3-50A, are estimated by the observations from [NeII] 12.8 micron, [ArIII] 8.99 micron, and [SIV] 10.51 micron, which have different ionizing potentials. The line flux ratios suggest much later spectral types for the ionizing sources than the radio continuum does. The UC HII regions are likely to be ionized by massive star clusters.

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