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Title:
The evolution of Planetary Nebula Nuclei (PNN)
Authors:
Shaw, R. A.
Affiliation:
AA(Illinois Univ., Urbana-Champaign.)
Publication:
Ph.D. Thesis Illinois Univ., Urbana-Champaign.
Publication Date:
00/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL PHOTOGRAPHY, PHOTOMETRY, PLANETARY NEBULAE, STELLAR EVOLUTION, COMPUTATION, DISK GALAXIES, STELLAR LUMINOSITY, STELLAR MAGNITUDE, STELLAR TEMPERATURE, SURVEYS
Bibliographic Code:
1985PhDT........13S

Abstract

The evolution of planetary nebula nuclei (PNNs) is examined with the aid of the most recent available stellar evolution calculations and new observations of these objects. Their expected distribution in the log L-log T plane is calculated. The distribution is found to be insensitive both to the assumed range of main-sequence progenitor mass and to reasonable variations in the age and the star forming history of the galactic disk. Rather the distribution is determined by the strong dependence of the rate of stellar evolution upon core mass, the steepness of the initial mass function, and to a lesser extent the finite lifetime of an observable planetary nebula. An extensive photometric and smaller photographic survey of southern hemisphere planetary nebulae (PNs) is presented. Seven new PNs were discovered in or near Baade's Window, and total fluxes in several nebular lines, relative to H beta, are presented for 134 southern PNs. New B and/or V magnitudes for the nuclei of 117 PNs are presented, and are combined with 54 magnitudes (as well as limits for ten others) from absolute photometry of northern PNNs. A superior method of extracting stellar continuum fluxes from a bright nebular background is developed. The continuum measurements are compared with the widely circulated list of preliminary central star magnitudes by Shao and Litter, which are shown to suffer frequently from severe contamination from the nebular continuum.
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