Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..385p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 385-403. Research supported by U
Astronomy and Astrophysics
Astronomy
11
Cosmic Dust, H Ii Regions, Interstellar Matter, Ionized Gases, Star Formation, Thermal Emission, Grain Size, Infrared Astronomy Satellite, Infrared Radiation, Stellar Cores, Stellar Envelopes
Scientific paper
The results of a combined near-infrared and IRAS mapping study of five H II regions are presented for which fairly complete information at optical and radio wavelengths previously existed. The near-infrared observations, carried out with the 2.1-m telescope at Observatorio de San Pedro Martir (Mexico), made it possible to study the stellar content at the core of each nebula, while an analysis of extended near-infrared emission zones showed these to arise mainly from ionized gas (S148 and S206) or through scattering and thermal emission from dust grains surrounding a massive young star (S269-IRS2). The analysis of IRAS data, on the other hand, suggests that two different populations of grains contribute to the observed 12- to 100-micron fluxes, and these are modeled with a small sized, PAH-type, grain component plus the 'standard' interstellar silicate grains.
Mampaso Antonio
Pismis Paris
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