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Astron. Astrophys. 315, L257-L260 (1996)

The ISO LWS grating spectrum of NGC 7027*

X.-W. Liu1, M.J. Barlow1, Nguyen-Q-Rieu2, Truong-Bach2, P. Cox3, D. P'equignot4, P.E. Clegg5, B.M. Swinyard6, M.J. Griffin5, J.P. Baluteau7, T. Lim8, C.J. Skinner9, H.A. Smith10, P.A.R. Ade5, I. Furniss1, W.A. Towlson1, S.J. Unger6, K.J. King6, G.R. Davis11, M. Cohen12, R.J. Emery6, J. Fischer13, W.M. Glencross1, E. Caux14, M.A. Greenhouse10, C. Gry7,8, M. Joubert15, D. Lorenzetti16, B. Nisini17, A. Omont18, R. Orfei17, P. Saraceno17, G. Serra14, H.J. Walker6, C. Armand8, M. Burgdorf8, A. Di Giorgio8, S. Molinari8, M. Price8, D. Texier8, S. Sidher8, and N. Trams8

1 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
2 Observatoire de Paris, 61 avenue de l'Observatoire, F-75014 Paris, France
3 Institut d'Astrophysique Spatiale, Bât. 120, Universit'e Paris XI, F-91405 Orsay, France
4 Observatoire de Paris-Meudon, F-92190 Meudon, France
5 Department of Physics, Queen Mary and Westfield College, Mile End Road, London E1 4NS, UK
6 Space Science Department, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK
7 Laboratoire d'Astronomie Spatiale, CNRS, BP 8, F-13376 Marseille Cedex 12, France
8 The LWS Instrument-Dedicated Team, ISO Science Operations Center, P.O. Box 50727, E-28080 Madrid, Spain
9 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
10 National Air and Space Museum, Smithsonian Institute, Laboratory for Astrophysics, Washington, DC 20560, USA
11 Institute of Space and Atmosphere Studies, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2
12 Radio Astronomy Laboratory, 601 Campbell Hall, University of California, Berkeley, CA 94720, USA
13 Naval Research Laboratory, Remote Sensing Division, 4555 Overlook Ave, SW, Washington, DC 20375, USA
14 Centre d'Etude Spatiale des Rayonnements, CESR/CNRS-UPS, BP 4346, F-31029 Toulouse Cedex, France
15 CNES, 2 place Maurice Quentin, F-75001 Paris, France
16 Osservatorio Astronomico di Roma, I-00040 Monte Porzio, Italy
17 CNR-Istituto di Fisica dello Spazio Interplanetario, Casella Postale 27 I-00044 Frascati, Italy
18 Institut d'Astrophysique, 98bis boulevard Arago, F-75014 Paris, France

Received 16 July 1996 / Accepted 19 August 1996

Abstract. We present a high signal-to-noise ISO Long Wavelength Spectrometer (LWS) grating spectrum of the planetary nebula NGC 7027 from 43-194 img2.gifm. In total 40 emission lines have been detected, with 30 identified. From the ionized region, we observe fine-structure lines from [N II], [N III] and [O III]. The [O I] and [C II] fine-structure lines from the photodissociation region are the strongest features observed in this spectral region. Amongst the molecular lines, 11 pure rotation CO lines from J=14-13 up to J=24-23 have been detected. The most striking result, however, is the detection in this carbon-rich nebula of the o-H2O 179.53 img2.gifm and the OH 119.3 img2.gifm fundamental lines. Astrophysical implications are briefly discussed.

Key words: planetary nebulae: general - planetary nebulae: individual: NGC,7027 - ISM: atoms - ISM: 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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