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Title:
The 3.2-3.6 micron spectra of monoceros R2/IRS-3 and Elias 16
Authors:
Sellgren, K.; Smith, R. G.; Brooke, T. Y.
Affiliation:
AA(Ohio State University, Columbus, OH, US), AB(Ohio State University, Columbus, OH, US), AC(NASA. Jet Propulsion Laboratory, Pasadena, CA, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 433, no. 1, p. 179-186 (ApJ Homepage)
Publication Date:
09/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Cosmic Dust, Giant Stars, Infrared Astronomy, Infrared Spectra, Interstellar Extinction, Interstellar Matter, Pre-Main Sequence Stars, Carbon, Chemical Bonds, Hydrocarbons, Interstellar Chemistry, Line Spectra, Methyl Alcohol, Molecular Clouds
DOI:
10.1086/174634
Bibliographic Code:
1994ApJ...433..179S

Abstract

We have obtained 3.2-3.6 micron spectra, with a resolution lambda/delta-lambda approximately 750, of the protostar Mon R2/IRS-3 and of Elias 16, a background K giant behind the Taurus molecular cloud. A feature at 3,482 microns (2872/cm), with a full width at half-maximum of 0.09 microns (76/cm), is clearly seen in Mon R2/IRS-3. This feature is not detected in Elias 16. The 3.482 micron feature in Mon R2/IRS-3 is similar to a feature at 3.466-3.478 microns (2875-2885/cm) detected by Allamandola et al. in four protostars and attributed by these authors to a CH stretch in hydrocarbons dominated by sp3-bonded carbon. Neither Mon R2/IRS-3 nor Elias 16 shows absorption at 3.540 microns (2825/cm), which has been detected in two of the four protostars observed by Allamandola et al. and attributed by them to CH3OH ice. Our limit on CH3OH ice toward Elias 16 is compared to models of gas-grain chemistry in dark clouds. Our results confirm those of Allamandola et al. that at this resolution the 3.4 micron absorption due to dust in molecular clouds has very different spectral structure than that due to dust in the diffuse interstellar medium.

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