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Nonradial Pulsational Analyses of the Pulsating Central Stars of Planetary Nebulae1

Published online by Cambridge University Press:  19 July 2016

Sumner Starrfield  and
Arthur N. Cox
Sumner Starrfield
Affiliation:
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM
Arthur N. Cox
Affiliation:
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM

Abstract

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We have performed nonradial pulsation analyses of the central star of the planetary nebula K1-16. K1-16 is a very unusual nebulae which appears to have ejected material that is very rich in helium. The central star shows no evidence for hydrogen in its spectrum and the helium and carbon lines are in emission. Grauer and Bond (Ap. J., 277, 211, 1984) discovered that it is pulsating with periods around 1700 sec. Although its spectral characteristics are similar to those of the PG1159-035 variables, it is pulsating in much longer periods than they are.

Type
III. Central Stars
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 311
Copyright
Copyright © Kluwer 1989