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A New Method for Observational Testing of the Planetary Nebulae Nuclei Evolution

Published online by Cambridge University Press:  19 July 2016

R. Szczerba
R. Szczerba*
Affiliation:
Polish Academy of Sciences, N. Copernicus Astronomical Center, Laboratory of Astrophysics, Toruń, Poland

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Planetary nebulae (PNe) are very useful as a tool for testing the theory of stellar evolution. The most widely applied method in this respect is the Hertzsprung-Russell (H-R) diagram. However, the observed positions of planetary nebulae nuclei (PNNi) on the H-R diagram are subject to large uncertainties, mostly due to inaccurate distances to them. On the other hand, the (absolute visual magnitude, age)-diagram also is not free of this problem. Therefore, an attempt has been done to develop a new method which is distance-independent. For comparison between theory and observations we propose the I (Hell λ 4686) /I(H β) versus log [I(H β, PN)/IC (H β, PNN)] diagram. Both ratios reflect the evolutionary status of the central star and the surrounding nebula. Consequently, such diagram is a valuable tool for studying common evolution of the PNN-PN system.

Type
VI. Evolution
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 539
Copyright
Copyright © Kluwer 1989 

References

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