Infrared studies of southern AFGL sources. II - GL4176 and GL4182: two sources in star forming regions

Details Infrared studies of southern AFGL sources. II - GL4176 and GL4182: two sources in star forming regions Infrared studies of southern AFGL sources. II - GL4176 and GL4182: two sources in star forming regions

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157...29p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 1, March 1986, p. 29-34.

Astronomy and Astrophysics

Astrophysics

3

Infrared Photometry, Molecular Clouds, Southern Sky, Stellar Evolution, Stellar Spectrophotometry, Absorption Spectra, Black Body Radiation, Far Infrared Radiation, H Ii Regions, Optical Thickness, Stellar Luminosity

Scientific paper

Based on 1.25-20 micron photometry and 2-4 and 8-13 micron CVF spectra collected in February 1983 using the 1 and 3.6m La Silla ESO telescopes, infrared studies of two southern AFGL sources are reported. The GL4176 blackbody energy distribution with strong absorption features at 3.1 and 9.7 microns, and the shape of the 3.1 absorption band, suggest that the source is a very young object embedded in molecular clouds. A visual extinction of 84 and a luminosity of 17,000 (D/kpc) squared solar luminosities are derived for the source. The diffuse near-IR emission of GL4182-Irs 1 is consistent with the suggestion that the object is a compact H II region, and a visual extinction of 32 and a 9.7-micron optical depth of 2.52 have been derived from the 8-13 micron spectra. Assuming a 4-kpc distance to GL4182-Irs 1, the observed luminosity of 250,000 solar luminosities is consistent with the hypothesis that an 06-7 embedded star is ionizing the H II region.

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