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The ISO/LWS spectrum of the EGG nebula, AFGL 2688

Cox, P., Gonzalez-Alfonso, E., Barlow, M. J., Liu, X.-W., Lim, T., Swinyard, B. M., Cernicharo, J., Omont, A., Caux, E., Gry, C., Griffin, M. J., Baluteau, J.-P., Clegg, P. E., Sidher, S., Pequignot, D., Rieu, Nguyen Q., King, K. J., Ade, Peter A. R., Towlson, W. A., Emery, R. J., Furniss, I., Joubert, M., Skinner, C. J., Cohen, M., Armand, C., Burgdorf, M., Eward, D., Di Giorgio, A., Molinari, S., Texier, D., Trams, N., Unger, S. J., Glencross, W. M., Lorenzetti, D., Nisini, B., Orfei, R., Saraceno, P. and Serra, G. 1996. The ISO/LWS spectrum of the EGG nebula, AFGL 2688. Astronomy and Astrophysics 315 , L265-L268.

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We present an ISO Long Wavelength Spectrometer (LWS) grating spectrum of the carbon-rich proto-planetary nebula AFGL 2688 between 43 and 194μm. 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 ~400K.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: EDP Sciences
ISSN: 0004-6361
Date of Acceptance: 13 September 1996
Last Modified: 04 Jun 2017 06:35

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