Bands of solid CO
in the 2-3μm spectrum of S 140:IRS1*
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
Corresponding author: J. V. Keane, jacquie@astro.rug.nl
Received:
14
November
2000
Accepted:
6
July
2001
We investigate the 2-3
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 
and the 
combination modes of
solid 
. 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: individual: S 140:IRS1 / infrared: stars
© ESO, 2001