The transition from AGB stars to planetary nebulae as seen by ISO.

Details The transition from AGB stars to planetary nebulae as seen by ISO. The transition from AGB stars to planetary nebulae as seen by ISO.

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511...97g&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

11

Scientific paper

We present a classification scheme for stars evolving in the transition phase between the Asymptotic Giant Branch (AGB) and the Planetary Nebula (PN) stage based on the detailed analysis of low resolution infrared SWS spectra from 2 to 45 μm of a large sample of stars available in the Infrared Space Observatory (ISO) Data Archive. The classification is made on the basis of the detection and analysis of: i) gas phase features in the extended atmospheres of the AGB stars; ii) solid state features in the neutral circumstellar shells surrounding the transition objects; and iii) nebular emission lines in the ionized PNe. This information, combined with the observed overall infrared energy distribution, is used to determine the evolutionary stage of each of the sources in the sample. The results here presented provide a complete view of the spectroscopic evolution expected in this short transition phase as a function of the mass of the progenitor star as the starting point for future spectroscopic research on this field in the infrared range.

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