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Chemical abundances and metallicity of Planetary Nebulae

Published online by Cambridge University Press:  25 May 2016

C. Y. Zhang  and
S. Kwok
C. Y. Zhang
Affiliation:
University of Calgary, Calgary, Canada
S. Kwok
Affiliation:
University of Calgary, Calgary, Canada

Extract

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Confrontations of the dredge-up theory with observed patterns of chemical abundances of planetary nebulae (PNs) have been carried out by many authors (see, e.g., Kaler & Jacoby 1990, 1991; Stasińska & Tylenda 1990). Although these studies suggest that the observational abundance ratios of PNs can qualitatively be explained by the current dredge-up theory, scatters around the theoretical predictions in their diagrams are always large. This has led Ratag (1991) to conclude that there is no correlation at all between the nebular abundances and the core mass of CSPNs (see also Pottasch 1993).

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 291
Copyright
Copyright © Kluwer 1997 

References

Kaler, J. B. & Jacoby, G. H. 1990, ApJ, 362, 491.Google Scholar
Kaler, J. B. & Jacoby, G. H. 1991, ApJ, 382, 134.Google Scholar
Pottasch, S. R., 1993, in IAU Symp. 155, p.449.Google Scholar
Ratag, M. A. 1991, , .Google Scholar
Stasińska, G., & Tylenda, R. 1990, A&A, 240, 467.Google Scholar
Zhang, C. Y. & Kwok, S. 1993, ApJS, 88, 137.Google Scholar