Three Micron Hydrocarbon and Methanol Absorption in Taurus

Details Three Micron Hydrocarbon and Methanol Absorption in Taurus Three Micron Hydrocarbon and Methanol Absorption in Taurus

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...472..665c&link_type=abstract

Astrophysical Journal v.472, p.665

Astronomy and Astrophysics

Astronomy

87

Ism: Dust, Extinction, Infrared: Ism: Lines And Bands, Ism: Molecules

Scientific paper

The 3.3-4.0 μm spectral region contains the fundamental C-H stretching vibrations of alcohols and aliphatic hydrocarbons and provides a powerful method of characterizing the organic component of interstellar ices. Observations of sources in and behind the Taurus dark cloud are presented. We detect the 3.47 i#m hydrocarbon feature toward Elias 16 (field star) and HL Tau (T Tauri star). Elias 16 provides the first detection of the 3.47 i#m feature in the quiescent cloud medium. Our results are consistent with a location for the 3.47 μm absorber in the grain mantle material rather than the core. The 3.54 μm methanol (CH3OH) feature is not detected in any of the sources to a limit of υ3.54/AV < 0.0009, and CH3OH therefore has an abundance relative to H2O, which is likely to be less than 5%. This result sets limits on models for mantle evolution which involve processing of CH3OH-rich ices to form more complex organic species in regions of active star formation.

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