Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..249h&link_type=abstract
The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460
Computer Science
Infrared: Stars, Line: Identifications, Planetary Nebulae: Individual (Crl2688, Crl618, Ngc7027), Stars: Abundances, Stars: Carbon, Stars: Evolution
Scientific paper
We compare ISO LWS observations of three C-rich objects typical of each step of the fast transition of an AGB star to the Planetay Nebula stage: CRL 2688, a very young Proto-Planetary Nebula, CRL 618, a Proto-Planetary Nebula, and NGC 7027, a young Planetary Nebula. Furthermore, we study the mm, submm, and IR CO emission from CRL 2688. We underline the violent changes that occur in the chemical composition of these objects during their evolution due to the increasing UV radiation field and the strong shocks generated by fast stellar winds. The importance of these mechanisms depends on the degree of evolution of the star. The circumstellar envelopes of evolved stars are important objects for the stellar evolution. As proved by ISO, these objects are very good targets for the Herschel Space Observatory (HSO, ex-FIRST). We present here what the HSO will teach us about these objects.
Cernicharo Jose
Goicoechea Javier R.
Herpin Fabrice
Pardo Juan Ramon
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