Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..463s&link_type=abstract
Astronomy and Astrophysics, Vol.276, NO. 2/SEPII, P. 463, 1993
Astronomy and Astrophysics
Astrophysics
29
Stars, Evolution, Post-Agb, Planetary Nebulae, General
Scientific paper
The morphology of 111 Galactic planetary nebulae has been studied in relation to the evolutionary stage of their central stars. In order to locate these stars on the logTeff - logL/Lsun plane, we have calculated the Zanstra temperatures with the most up to date fluxes and magnitudes available in the literature. Distances to the nebulae were estimated with statistical methods. The different nature and evolutionary stages of central stars have been related to the morphologies of the surrounding nebulae in a statistical sense. We found that multiple shell nebulae contain stars that are at a different evolutionary stage than those of single shell nebulae; we also found that bipolar and elliptical planetary nebulae very likely contain central stars with a different mass distribution; furthermore, we build an optical thickness sequence of morphological types.
Corradi Romano L. M.
Schwarz Hugo E.
Stanghellini Letizia
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