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The N/O-Core Mass Relation in Planetary Nebulae

Published online by Cambridge University Press:  12 April 2016

J.B. Kaler ,
R.A. Shaw  and
K.B. Kwitter
J.B. Kaler
Affiliation:
University of Illinois
R.A. Shaw
Affiliation:
Lick Observatory
K.B. Kwitter
Affiliation:
Williams College

Extract

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We define the relationship between nitrogen enrichment in planetary nebulae and the mass of the nucleus. N/O remains flat at about 0.3 (double solar) from a core mass of 0.55 M(sun) to 0.8 M(sun), whereupon it rises quickly to values that approach and may exceed 2. The rate of increase of N/O with core mass exceeds that predicted for giant stars by standard dredge-up and mass-loss theories.

Type
3. Evolution of Peculiar Red Giant Stars
Information
International Astronomical Union Colloquium , Volume 106: Evolution of Peculiar Red Giant Stars , 1989 , pp. 235
Copyright
Copyright © Cambridge University Press 1989