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Bands of solid CO_2 in the 2-3 µm spectrum of S 140:IRS1

Keane, J. V. and Boogert, A. C. A. and Tielens, A. G. G. M. and Ehrenfreund, P. and Schutte, W. A. (2001) Bands of solid CO_2 in the 2-3 µm spectrum of S 140:IRS1. Astronomy and Astrophysics, 375 (3). L43-L46. ISSN 0004-6361.

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We investigate the 2-3 µm ISO-SWS spectrum of the luminous protostellar object S 140:IRS1. Two narrow absorption features are detected at 2.70 and 2.77 μm, which are well fitted with laboratory spectra of the ν_1 + ν_3 and the 2ν_2 + ν_3 combination modes of solid . The ice in this line of sight must have been subjected to significant heating, in agreement with previously studied CO_2 bands. A combined laboratory fit to all CO2 bands detected toward S 140:IRS1 shows, among others, the need for particle shape calculations for the CO_2 stretch mode. Finally, we discuss the absence of features of isolated H_2O and dangling OH groups in the spectrum of S 140:IRS1.

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Additional Information:© ESO, 2001. Received: 14 November 2000. Accepted: 6 July 2001. This research has made use of the Leiden Observatory Laboratory database of spectra (
Subject Keywords:ISM: molecules / ISM: abundances / stars: individual: S 140:IRS1 / infrared: stars
Issue or Number:3
Record Number:CaltechAUTHORS:20170408-161748561
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Official Citation:Bands of solid CO2 in the 2-3μm spectrum of S 140:IRS1 J. V. Keane, A. C. A. Boogert, A. G. G. M. Tielens, P. Ehrenfreund and W. A. Schutte A&A, 375 3 (2001) L43-L46 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76164
Deposited By: 1Science Import
Deposited On:26 Jul 2017 22:59
Last Modified:03 Oct 2019 16:58

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