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Astron. Astrophys. 315, L365-L368 (1996)

ISO-SWS observations of solid state features towards RAFGL 7009S*

L. d'Hendecourt1, M. Jourdain de Muizon2,3, E. Dartois1, M. Breitfellner4, P. Ehrenfreund5,1, J. Benit1, F. Boulanger1, J.L. Puget1, and H.J Habing5

1 Institut Astrophysique Spatiale, Bat.121, Campus d'Orsay, F-91405 Orsay, France
2 DESPA, Observatoire de Paris, F-92190 Meudon, France
3 LAEFF-INTA, ESA Satellite Tracking Station, P.O. Box 50727, E-28080 Madrid, Spain
4 ISO Science Operations, ESA/VILSPA Satellite Tracking Station, P.O. Box 50727, E-28080 Madrid, Spain
5 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands

Received 8 July 1996 / Accepted 22 August 1996

Abstract. We report the detection of various solid state molecular features in the SWS01 spectrum of a protostellar object, RAFGL 7009S. Identified molecules include H2O, CO, CO2 together with 13CO2 and CH4. Other less firmly identified features are observed that appear in laboratory spectra of UV photolysed ices. We thus confirm the previous detection of CO2 in the IRAS-LRS spectra of a number of embedded sources and present the detection of solid CH4. In addition, we estimate the column densities of some solid state species towards RAFGL 7009S. Due to its extreme extinction this source represents a unique target for the detection of weak solid state absorption features, that are commonly observed in laboratory experiments.

Key words: ISM: molecules - ISM: abundances - ISM: dust, extinction - ISM: individual: RAFGL 7009S

* 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 United Kingdom) and with the participation of ISAS and NASA.

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