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

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

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..345j&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 345

Physics

Proto- And Planetary Nebulae

Scientific paper

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.

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