Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204...68s&link_type=abstract
Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 1, p. 68-72.
Astronomy and Astrophysics
Astronomy
6
Astronomical Models, Cosmic Dust, Nebulae, Ultraviolet Absorption, H Ii Regions, Helium, Infrared Astronomy, Radiative Recombination, Radio Astronomy, Stellar Spectra
Scientific paper
Models for the H II region NGC 2024 containing ultraviolet-absorbing dust are presented. In order to account for the deficiency of He recombination-line emission observed from the nebula, these models require that the absorption cross section of the dust increase rapidly with frequency between the ionization limits of H and He, at least as fast as the square of the frequency. It is shown that the presence of ultraviolet absorbing dust in NGC 2024 is not necessarily inconsistent with recent observations of the infrared source 2024 No. 2, as has been suggested, and that the effective temperature of 2024 No. 2 may have been underestimated. Models for the H II region with dust are compared with models involving a low-temperature exciting star, and some of the radio and infrared observations are shown to favor the former. Further optical observations are proposed to distinguish between these two suggestions.
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