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Central Stars of Old Planetary Nebulae

Published online by Cambridge University Press:  07 August 2017

R. Napiwotzki
R. Napiwotzki*
Affiliation:
Institut für Theoretische Physik und Sternwarte der Universität, Olshausenstr. 40, D-2300 Kiel, Germany

Extract

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During a program for the observation of central stars of old planetary nebulae 29 stars are classified until now. Most of them (22) are belonging to the hydrogen-rich sequence and resemble either high-gravity sdO stars or white dwarfs (14 DAOs, 3 DAs). 3 are hydrogen-deficient PG 1159 stars, and also 3 are hybrid type stars Further 3 CPN are close binaries, whose evolution has been certainly influenced by this circumstance. A complete list of so far observed objects is given in Napiwotzki (1992).

Type
II. Highlights on the Nuclei
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 88
Copyright
Copyright © Kluwer 1993 

References

Hummer, D.G., Mihalas, D., 1988, ApJ 277, 233 Google Scholar
Napiwotzki, R., 1992, Proc. Kiel/CCP7 workshop on Atmospheres of Early Type Stars, eds. Heber, U., Jefferey, S., Springer, p. 310 Google Scholar
Werner, K., 1986, A&A 161, 171 Google Scholar