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CO emission from shock and PDR in C-rich PN and post-AGB objects

Justtanont, K; Barlow, MJ; Tielens, AGGM; Sylvester, RJ; Cox, P; Rieu, NQ; Skinner, CJ; (1999) CO emission from shock and PDR in C-rich PN and post-AGB objects. In: Cox, P and Kessler, MF, (eds.) The Universe as Seen by ISO: Proceedings of the Conference The Universe as Seen by ISO 1998. (pp. pp. 345-348). European Space Agency: Paris, France. Green open access

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Abstract

The LWS full grating scans of the PN, NGC 7027, and post-AGB objects, GL618 and GL2688 reveal a forest of lines which are identified as CO rotational lines. These lines are used as diagnostics for warm gas around these objects. For NGC 7027 and GL 618, the hot central star is the source of the ionizing photons, creating a PDR. GL2688 is a cooler post-AGB star with evidence of a fast wind which results in shock heated gas. From the CO observations, we can estimate the density of the molecular layer. In agreement with earlier work, we found that the molecular layer is warm (T~ 350-600 K) and dense (n~ 107 cm-3). This may have implications on mass loss during the last stage of the evolution before stars evolve off the AGB.

Type: Proceedings paper
Title: CO emission from shock and PDR in C-rich PN and post-AGB objects
Event: Conference on the Universe as Seen by ISO
Location: PARIS, FRANCE
Dates: 20 October 1998 - 23 October 1998
ISBN: 92-9092-708-9
Open access status: An open access version is available from UCL Discovery
Publisher version: http://general-tools.cosmos.esa.int/iso/meetings/p...
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: PROTO- AND PLANETARY NEBULAE
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096239
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