An infrared study of three Wolf-Rayet ring nebulae

Details An infrared study of three Wolf-Rayet ring nebulae An infrared study of three Wolf-Rayet ring nebulae

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..197m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 197-211. Research supported by Academy of Finland.

Astronomy and Astrophysics

Astronomy

35

Infrared Astronomy, Nebulae, Wolf-Rayet Stars, Cosmic Dust, Infrared Astronomy Satellite, Interstellar Extinction

Scientific paper

The IRAS colors of the Rolf-Rayet bubble RCW 58 surrounding HD 96548 are studied by analyzing the IRAS survey data with the Groningen Exportable High-Resolution Analysis system and by using the Chopped Photometric Channel high-resolution imaging at 50 microns. The IRAS fluxes of these nebulae at 25, 60, and 100 microns arise from dust emission rather than from atomic emission lines. Because of the low 12-micron fluxes from the bubbles, the emission is calculated on the basis of continuum radiation from dust, rather than emission from the 'unidentified infrared bands' and continuum associated with them. RCW 58 has an uncertain F(100 microns) flux. A simple MRN grain mixture can fit both the R25 and R60 ratios, but the required radiation energy density (100 eV/cu cm) is higher than would be expected for the mean (44 eV/cu cm). The relatively large observed 25-micron fluxes in NGC 6888 and S303 are explained in terms of emission from small grains that are transiently heated to temperatures well above 100 K. The derived mass estimates are quite sensitive to the observed fluxes.

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