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Variability in Post-AGB Stars: Pulsation in Proto-Planetary Nebulae

Published online by Cambridge University Press:  30 December 2019

Bruce Hrivnak ,
Gary Henson ,
Griet Van de Steene ,
Hans Van Winckel Open the ORCID record for Hans Van Winckel [Opens in a new window] ,
Todd Hillwig  and
Matthew Bremer
Bruce Hrivnak
Affiliation:
Dept. of Physics & Astronomy, Valparaiso University, Valparaiso, IN 46383, USA emails: bruce.hrivnak@valpo.edu, todd.hillwig@valpo.edu, matthew.bremer@valpo.edu
Gary Henson
Affiliation:
Dept. of Physics & Astronomy, East Tennessee State University, Johnson City, TN 37614, USA email: hensong@mail.etsu.edu
Griet Van de Steene
Affiliation:
Royal Observatory of Belgium, Astronomy & Astrophysics, Ringlaan 3, Brussels, Belgium email: g.vandesteene@oma.be
Hans Van Winckel
Affiliation:
Inst. voor Sterrenkunde, KU Leuven, Celestijnenlaan 200 D, B-3001, Leuven, Belgium email: Hans.VanWinckel@kuleuven.ac.be
Todd Hillwig
Affiliation:
Dept. of Physics & Astronomy, Valparaiso University, Valparaiso, IN 46383, USA emails: bruce.hrivnak@valpo.edu, todd.hillwig@valpo.edu, matthew.bremer@valpo.edu
Matthew Bremer
Affiliation:
Dept. of Physics & Astronomy, Valparaiso University, Valparaiso, IN 46383, USA emails: bruce.hrivnak@valpo.edu, todd.hillwig@valpo.edu, matthew.bremer@valpo.edu
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Abstract

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We have been intensely monitoring photometric variability in proto-planetary nebulae (PPNe) over the past 25 years and radial velocity variability over the past ten years. Pulsational variability has been obvious, in both the light and velocity, although the resulting curves are complex, with multiple periods and varying amplitudes. Observed periods range from 25 to 160 days, and the periods and amplitudes reveal evolutionary trends. We will present our observational results to date for approximately 30 PPNe, and discuss these results, including the search for period changes that might help constrain post-AGB evolutionary timescales.

Keywords

AGB and post-AGBstars: variable
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 423 - 424
Copyright
© International Astronomical Union 2019 

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