Stellar evolution in the Post-AGB stage

Details Stellar evolution in the Post-AGB stage Stellar evolution in the Post-AGB stage

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006lnea....2..149s&link_type=abstract

Lecture Notes and Essays in Astrophysics, vol. 2, p. 149-158.

Astronomy and Astrophysics

Astrophysics

Post-Agb Stars, Planetary Nebulae, Iras Two-Colour Diagram

Scientific paper

We present the catalogue resulting of 15 years of spectroscopic observations of a sample of 254 IRAS sources showing far infrared colours similar to those of well-known as post-AGB stars, 21 as ``transition sources'', and 36 as planetary nebulae, some of them strongly reddened. The large majority remained unidentified in the literature or were poorly known by the time when this spectroscopic survey started. Among the rest of sources in the sample, we were also able to identify 38 young stellar objects, 5 peculiar stars and 2 Seyfert galaxies. Up to 46 sources in our spectroscopic sample were found to show no optical counterpart, most of them are suggested to be heavily obscured post-AGB stars, rapidly evolving in their way to become planetary nebulae. A preliminary analysis of the distribution of post-AGB stars and planetary nebulae in the IRAS two colour diagram is presented. We also analyse the spectral type distribution of the post-AGB stars observed.

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