Near-Infrared Subarcsecond Observations of Ultracompact H II Regions

Details Near-Infrared Subarcsecond Observations of Ultracompact H II Regions Near-Infrared Subarcsecond Observations of Ultracompact H II Regions

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..155..123a&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 155, Issue 1, pp. 123-148.

Physics

Optics

15

Catalogs, Ism: H Ii Regions, Infrared: Ism, Instrumentation: Adaptive Optics, Techniques: High Anular Resolution

Scientific paper

We present adaptive optics (AO) assisted J, H, and K/K' images of eight ultracompact H II (UC H II) regions taken with the ALFA and ADONIS AO systems at Calar Alto and La Silla observatories. The images show details of the stellar population and the near-IR morphology of UC H II regions with unprecedented resolution. We have searched for the ionizing sources of the regions using near-IR photometry. The spectral type of the ionizing and most luminous stars inferred from our photometry has been compared with spectral type estimates from IRAS and published radio-continuum measurements. We find that the photometric near-IR spectral types are earlier than estimates from radio and IRAS data. This difference is alleviated when stellar spherical models including line blanketing and stellar winds instead of non-LTE plane-parallel models are used to derive the radio- and IRAS-based spectral types. We also made an attempt to correlate the properties of the near-IR ionizing population with MSX data and published CS measurements. No correlation was found. We note that in two of the regions (G309.92+0.48 and G61.48+0.09B1), the best candidate to ionize the region is possibly a supergiant.
Based on observations at the ESO 3.6 m telescope on La Silla observatory under Program-ID No. 64.I-0606(B) and the 3.5 m telescope on Calar Alto observatory during the ALFA science verification program.

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