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Astron. Astrophys. 315, L265-L268 (1996)

The ISO/LWS spectrum of the Egg nebula, AFGL 2688*

P. Cox1,8, E. González-Alfonso2, M.J. Barlow3, X.-W. Liu3, T. Lim4, B.M. Swinyard5, J. Cernicharo6,2, A. Omont7, E. Caux8, C. Gry4,10, M.J. Griffin9, J.-P. Baluteau10, P.E. Clegg9, S. Sidher4, D. Péquignot11, Nguyen-Q-Rieu12, K.J. King5, P.A.R. Ade9, W.A. Towlson3, R.J. Emery5, I. Furniss3, M. Joubert13, C.J. Skinner14, M. Cohen15, C. Armand4, M. Burgdorf4, D. Eward4, A. Di Giorgio4, S. Molinari4, D. Texier4, N. Trams4, S.J. Unger5, W.M. Glencross3, D. Lorenzetti16, B. Nisini16, R. Orfei16, P. Saraceno16, and G. Serra8

1 Institut d'Astrophysique Spatiale, Bât. 120, Universit'e de Paris XI, F-91405 Orsay, France
2 Observatorio Astronomico Nacional. Apartado 1143. E-28800 Alcala de Henares, Spain
3 Dept. of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
4 The LWS Instrument-Dedicated-Team, ISO Science Operations Centre, P.O. Box 50727, E-28080 Madrid, Spain
5 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK
6 Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain
7 Institut d'Astrophysique de Paris, C.N.R.S., 98b bd. Arago, F-75014 Paris, France
8 Centre d'Etude Spatiale des Rayonnements, CESR/CNRS-UPS, BP 4346, F-31029 Toulouse Cedex, France
9 Dept. of Physics, Queen Mary and Westfield College Mile End Road, London E1 4NS, UK
10 Laboratoire d'Astronomie Spatiale, CNRS, BP 8, F-13376 Marseille Cedex 12, France
11 Observatoire de Paris, Section d'Astrophysique, F-92190 Paris, France
12 Observatoire de Paris, 61 avenue de l'Observatoire, F-75014 Paris, France
13 CNES, 2 place Maurice Quentin, F-75001 Paris, France
14 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
15 Radio Astronomy Laboratory, 601 Cambell Hall, University of California, Berkeley, CA  94720, USA
16 CNR-Instituto di Fisica dello Spazio Interplanetario, Casella Postale 27 I-00044 Frascati, Italy

Received 15 July 1996 / Accepted 13 September 1996

Abstract. We present an ISO Long Wavelength Spectrometer (LWS) grating spectrum of the carbon-rich proto-planetary nebula AFGL 2688 between 43 and 194  img18.gif . The far-infrared spectrum of AFGL 2688 is dominated by strong rotational transitions of CO which are detected from J=14-13 up to J=23-22. The atomic fine structure lines [O I] and [C II] are not detected. This is consistent with the cool central star of AFGL 2688 not having yet photodissociated the molecular gas ejected during the AGB phase. The far-infrared CO emission in AFGL 2688 appears to originate in shocked dense gas at a temperature of img19.gif .

Key words: planetary nebulae: general - planetary nebulae: individual (AFGL 2688) - interstellar medium: molecules

* 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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