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Issue A&A
Volume 375, Number 3, September 2001
Page(s) L43 - L46
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010977



A&A 375, L43-L46 (2001)
DOI: 10.1051/0004-6361:20010977

Bands of solid CO $_\mathsf{2}$ in the 2-3$ \mu$m spectrum of S 140:IRS1

J. V. Keane1, A. C. A. Boogert2, A. G. G. M. Tielens1, 3, P. Ehrenfreund4 and W. A. Schutte4

1  Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
2  California Institute of Technology, Downs Laboratory of Physics 320-47, Pasadena CA 91125, USA
3  SRON, PO Box 800, 9700 AV Groningen, The Netherlands
4  Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands

(Received 14 November 2000 / Accepted 6 July 2001 )

Abstract
We investigate the 2-3 ${\rm\mu m}$ ISO-SWS spectrum of the luminous protostellar object S 140:IRS1. Two narrow absorption features are detected at 2.70 and 2.77 $ \mu$m, which are well fitted with laboratory spectra of the ${\rm\nu_1 + \nu_3}$ and the ${\rm 2\nu_2 + \nu_3}$ combination modes of solid ${\rm CO_2}$. The ice in this line of sight must have been subjected to significant heating, in agreement with previously studied CO2 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 CO2 stretch mode. Finally, we discuss the absence of features of isolated H2O and dangling OH groups in the spectrum of S 140:IRS1.


Key words: ISM: molecules -- ISM: abundances -- stars: S 140:IRS1 -- infrared: stars

Offprint request: J. V. Keane, jacquie@astro.rug.nl

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© ESO 2001


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