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Light and Velocity Variability of Post-AGB Stars

Published online by Cambridge University Press:  25 May 2016

Bruce J. Hrivnak  and
Wenxian Lu
Bruce J. Hrivnak
Affiliation:
Dept. of Physics and Astronomy, Valparaiso University, Valparaiso, IN 46383, U.S.A.
Wenxian Lu
Affiliation:
Dept. of Physics and Astronomy, Valparaiso University, Valparaiso, IN 46383, U.S.A.

Abstract

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We have monitored velocity variability in nine proto-planetary nebulae (PPN) over a 5 year interval and have monitored light variability in 40 PPN over a 2 year interval. We find all nine of the objects to vary in velocity and almost all of the 40 to vary in light. Three of the objects display a clear periodicity in their velocity variations, and in all three the light varies with the same period as the velocity. Periodic light variations are found in six other objects. We interpret these as due to pulsation in the PPN.

Type
Session VI — Binarity
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 293 - 298
Copyright
Copyright © Kluwer 2000 

References

Bond, H. E. 1995, in Asymmetrical Planetary Nebulae, ed. Harpaz, A. and Soker, N. (Jerusalem: Israel Physics Society), p. 61 Google Scholar
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Kwok, S. 1993, Ann. Rev. Astron. Astrophys., 31, 63 CrossRefGoogle Scholar