Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.344..501p&link_type=abstract
Monthly Notice of the Royal Astronomical Society, Volume 344, Issue 2, pp. 501-520.
Astronomy and Astrophysics
Astronomy
33
Catalogues, Stars: Agb And Post-Agb, Stars: Evolution, Planetary Nebulae: General
Scientific paper
We have created a master list of Zanstra temperatures for 373 galactic planetary nebulae based upon a compilation of 1575 values taken from the published literature. These are used to evaluate mean trends in temperature for differing nebular morphologies. Among the most prominent results of this analysis is the tendency for η=TZ(HeII)/TZ(HeI) to increase with nebular radius, a trend which is taken to arise from the evolution of shell optical depths. We find that as many as 87 per cent of nebulae may be optically thin to H ionizing radiation where radii exceed ~0.16 pc. We also note that the distributions of values η and TZ(HeII) are quite different for circular, elliptical and bipolar nebulae. A comparison of observed temperatures with theoretical H-burning tracks suggests that elliptical and circular sources arise from progenitors with mean mass
The present results appear fully consistent with earlier analyses based upon nebular scale heights, shell abundances and the relative proportions of differing morphologies, and offer further evidence for a link between progenitor mass and morphology.
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