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

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

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.265c&link_type=abstract

Astronomy and Astrophysics, v.315, p.L265-L268

Astronomy and Astrophysics

Astrophysics

19

Planetary Nebulae: General, Planetary Nebulae: Individual (Afgl 2688), Interstellar Medium: Molecules

Scientific paper

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.

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