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Title:
Large planetary nebulae and their significance to the late stages of stellar evolution
Authors:
Kaler, James B.; Shaw, Richard A.; Kwitter, Karen B.
Affiliation:
AA(Illinois, University, Urbana), AB(NASA, Goddard Space Flight Center; Computer Sciences Corp., Greenbelt, MD), AC(Williams College, Williamstown, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 392-418. Research supported by the University of Illinois and Research Corp. (ApJ Homepage)
Publication Date:
08/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
PLANETARY NEBULAE, SPECTROPHOTOMETRY, STELLAR EVOLUTION, WHITE DWARF STARS, INTERSTELLAR EXTINCTION, STELLAR COMPOSITION, STELLAR CORES, STELLAR LUMINOSITY, STELLAR MAGNITUDE
DOI:
10.1086/169073
Bibliographic Code:
1990ApJ...359..392K

Abstract

Spectrophotometry of 75 large PNe with Shklovsky radii greater than 0.15 pc is presented and used to calculate nebular parameters and compositions, stellar Zanstra temperatures and luminosities, and core masses. Nine new Peimbert type I nebulae are identified. About 40 percent of the stars that are on cooling tracks are above 0.7 solar mass, and over 15 percent are above 0.8 solar mass. The large planetaries demonstrate a clear positive correlation between nitrogen enrichment and core mass. N/O is anticorrelated with O/H. The radii of the nebulae whose stars lie along specific cooling tracks increase monotonically with decreasing central star temperature. For a given central temperature, the nebular radii also increase with increasing core mass, showing that in this part of the log L-log T plane the higher mass cores evolve more slowly in agreement with theoretical prediction. However, theoretical evolutionary rates for the large nebulae stars appear to be much too slow.

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