[Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Resolving the Ionization Structures

Details [Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Resolving the Ionization Structures [Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Resolving the Ionization Structures

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..349t&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Other

Scientific paper

We present the results of ground-based imaging spectroscopy of the {[Ne II]} 12.8μm line emitted from the ultracompact (UC) H II regions; W51d, G45.12+0.13, G35.20-1.74 and Monoceros R2, with 2'' spatial resolution. We found that the overall distribution of the {[Ne II]} emission is generally in good agreement with the radio (5 or 15 GHz) VLA distribution for each source. The Ne+ abundance ({[Ne+/H+]}) distributions are also derived from the {[Ne II]} and the radio maps. As for G45.12+0.13 and W51d, the Ne+ abundance decreases steeply from the outer part of the map toward the radio peak. On the other hand, the Ne+ abundance distributions of G35.20-1.74 and Mon R2 show rather uniform. These results can be interpreted by the variation of ionizing structures of neon, which is primarily determined by the spectral type of the ionizing stars. We have evaluated the effective temperature of the ionizing star by comparing the Ne+ abundance averaged over the whole observed region with that calculated by the H II region model based on the recent non-LTE stellar atmosphere model: 38,500K (O8V) for W51d, 36,500K (O8.5V) for G45.12+0.13, 35,000-37,000K (O8.5V-O9V) for G35.20-1.74, and <= 33,000K (<=B0V) for Mon R2. These effective temperatures are consistent with those inferred from the Ne+ abundance distributions.

Affiliated with

Also associated with

No associations

Rating

[Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Resolving the Ionization Structures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with [Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Resolving the Ionization Structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and [Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Resolving the Ionization Structures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1061520