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.
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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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