The ISO LWS grating spectrum of NGC 7027.
Abstract
We present a high signal-to-noise ISO Long Wavelength Spectrometer (LWS) grating spectrum of the planetary nebula NGC 7027 from 43-194μm. 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-H_2_O 179.53μm and the OH 119.3μm fundamental lines. Astrophysical implications are briefly discussed.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1996
- Bibcode:
- 1996A&A...315L.257L
- Keywords:
-
- PLANETARY NEBULAE: GENERAL;
- PLANETARY NEBULAE: INDIVIDUAL: NGC 7027;
- ISM: ATOMS;
- ISM: MOLECULES