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Absorption features in the 5-8 micron spectra of protostars

1984; IOP Publishing; Volume: 287; Linguagem: Inglês

10.1086/162728

1538-4357

A. G. G. M. Tielens, L. J. Allamandola, Joel N. Bregman, J. H. Goebel, F. C. Witteborn, L. D’Hendecourt,

Astrophysics and Star Formation Studies

view Abstract Citations (79) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Absorption features in the 5-8 micron spectra of protostars. Tielens, A. G. G. M. ; Allamandola, L. J. ; Bregman, J. ; Goebel, J. ; D'Hendecourt, L. ; Witteborn, F. C. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1984 DOI: 10.1086/162728 Bibcode: 1984ApJ...287..697T Keywords: 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; Astrophysics full text sources ADS | data products SIMBAD (6)