Bands of solid CO2 in the 2-3 mu m spectrum of S 140:IRS1

Details Bands of solid CO2 in the 2-3 mu m spectrum of S 140:IRS1 Bands of solid CO2 in the 2-3 mu m spectrum of S 140:IRS1

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...375l..43k&link_type=abstract

Astronomy and Astrophysics, v.375, p.L43-L46 (2001)

Astronomy and Astrophysics

Astrophysics

14

Ism: Molecules, Ism: Abundances, Stars: S 140:Irs1, Infrared: Stars

Scientific paper

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 mu m, which are well fitted with laboratory spectra of the nu1 + nu3 and the 2nu2 + nu3 combination modes of solid CO2. 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. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.

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