Large planetary nebulae and their significance to the late stages of stellar evolution

Details Large planetary nebulae and their significance to the late stages of stellar evolution Large planetary nebulae and their significance to the late stages of stellar evolution

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..392k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 392-418. Research supported by the University of Ill

Astronomy and Astrophysics

Astrophysics

101

Planetary Nebulae, Spectrophotometry, Stellar Evolution, White Dwarf Stars, Interstellar Extinction, Stellar Composition, Stellar Cores, Stellar Luminosity, Stellar Magnitude

Scientific paper

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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