Absorption features in the 5-8 micron spectra of protostars

Details Absorption features in the 5-8 micron spectra of protostars Absorption features in the 5-8 micron spectra of protostars

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..697t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. 697-706.

Astronomy and Astrophysics

Astrophysics

68

Infrared Spectra, Interstellar Matter, Molecular Clouds, Pre-Main Sequence Stars, Protostars, Stellar Spectrophotometry, Absorption Spectra, Hydroxyl Radicals, Molecular Spectra, Near Infrared Radiation, Signal To Noise Ratios

Scientific paper

High signal-to-noise ratio 5 - 8 μm spectra of four sources embedded in molecular clouds are presented. All four sources show evidence for the presence of absorption features. These range from two relatively narrow bands at 6.0 and 6.8 μm in W33A to a broad, shallow feature, which extends from about 5.2 to 7.8 μm and shows some structure, in Mon R2-IRS2, BN, and NGC 2264. The 2 - 13 μm spectra of simple molecules and mixtures of simple molecules have been measured at low temperatures in the laboratory. Comparison of the observed spectra with the laboratory spectra leads to the conclusion that the rather narrow 6.0 and 6.8 μm absorption features in W33A are largely due to the OH bending mode in H2O and the CH deformation modes in saturated hydrocarbons, respectively. The implications of the observed differences in the 6.0 and 6.8 μm absorption features for interstellar grain chemistry are discussed.

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