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Astron. Astrophys. 315, L201-L204 (1996)

The ISO/LWS far infrared spectrum of IRC+10216*

J. Cernicharo1, M.J. Barlow2, E. González-Alfonso3, P. Cox4, P.E. Clegg 5, Nguyen-Q-Rieu6, A. Omont7, M. Guélin8, X.-W.Liu2, R.J. Sylvester2, T. Lim9, M.J. Griffin5, B.M. Swinyard10, S.J. Unger10, P.A.R. Ade5, J.-P. Baluteau11, E. Caux12, M. Cohen13, R.J. Emery10, J. Fischer15, I. Furniss2, W.M. Glencross2, M.A. Greenhouse14, C. Gry7,11, M. Joubert16, D. Lorenzetti17, B. Nisini18, R. Orfei18, D. Péquignot19, P. Saraceno18, G. Serra12, C.J. Skinner20, H.A. Smith14, W.A. Towlson2, H.J. Walker10, C. Armand9, M. Burgdorf9, D. Ewart9, A. Di Giorgio9, S. Molinari9, M. Price9, S. Sidher9, D. Texier9, and N. Trams9

1 CSIC. IEM. Dpto. Física Molecular, Serrano 123, E-28006 Madrid, Spain and OAN. Ap 1143, E-28800 A. de Henares, Spain
2 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
3 Universidad de Alcala de Henares, Dpto Física, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain
4 Institut d'Astrophysique Spatiale, Bât. 120, Université de Paris XI, F-91405 Orsay, France
5 Queen Mary and Westfield College, University of London, Mile End Road, London E1 4NS, UK
6 Observatoire de Paris, 61 avenue de l'Observatoire, F-75014 Paris, France
7 Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
8 IRAM, Domaine Universitaire de Grenoble, 300 rue de la Piscine, F-38406 St Martin d'Hères, France
9 The LWS Instrument-Dedicated Team, ISO Science Operations Centre, PO Box 50727, E-28080 Madrid, Spain
10 Rutherford Appleton Lab., Chilton, Didcot, Oxon OX11 0QX, UK
11 Laboratoire d'Astronomie Spatiale, CNRS, BP8, F-13376 Marseille, France
12 Centre d'Etude Spatiale des Rayonnements, CESR/CNRS-UPS, BP 4346, F-31029 Toulouse Cedex, France
13 Radio Astronomy Laboratory, 601 Cambell Hall, University of California, Berkeley, CA 94720, USA
14 National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA
15 Naval Research Laboratory, Remore Sensing Division, 4555 Overlook Ave, SW, Washington, DC 20375, USA
16 Observatorio Astronomico di Roma, I-00040 Monte Porzio, Italy
17 CNES, 2 place Maurice Quentin, F-75001 Paris, France
18 CNR-Instituto di Fisica dello Spazio Interplanetario, Casella Postale 27, I-00044 Frascati, Italy
19 Observatoire de Paris, Section d'Astrophysique, F-92190 Paris, France
20 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Received 17 July 1996 / Accepted 3 August 1996

Abstract. We present an ISO Long Wavelength Spectrometer (LWS) grating spectrum of the carbon-rich circumstellar envelope -CSE- of IRC+10216 between 43 and 197  img22.gif . The spectrum consists of strong dust emission plus a forest of emission lines from CO, HCN, H13CN and vibrationally excited HCN (img23.gif=11, 20,2 and img25.gif =1). All the CO lines between J=14-13 and J=39-38 have been detected while lines of HCN with J img26.gif as high as 48 have also been observed. The molecular emission arises from the warm and dense gas located in the innermost zone of the CSE. The CO and HCN emission can be easily explained if the vibrational and rotational temperatures are around 700-1500 K.

We also report the tentative detection of the bending mode of the C3 molecule around 62 cm-1 (157.2 img22.gif).

Key words: stars: AGB and post AGB - stars: individual: IRC+10216 - stars: circumstellar matter - infrared: stars

* 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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