Interstellar absorption features toward the compact infrared source W33A

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Absorption Spectra, Infrared Spectra, Interstellar Matter, Molecular Clouds, Abundance, Astronomical Spectroscopy, High Resolution, Nebulae, Spectrum Analysis

Scientific paper

A high-resolution (λ/Δλ ≡ 2000), broad-bandwidth (3.3 - 5.0 μm) spectrum of the compact infrared source W33 A is presented. Four absorption features are associated with compositionally distinct components in the interstellar medium: solid-phase C3, CN, or CH3OH at 4.9 μm, solid-phase CO and either solid or gaseous CH3NC near 4.6 μm, and the well-known "dirty ice" feature near 3 μm. The analysis of this spectrum supports chemically complex models of grain mantle evolution in cold, quiescent molecular clouds.

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