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The loss of large amplitude pulsations at the end of AGB evolution

Published online by Cambridge University Press:  30 December 2019

D. Engels
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Germany, email: dengels@hs.uni-hamburg.de
S. Etoka
Affiliation:
Jodrell Bank Centre for Astrophysics, University of Manchester, UK, email: sandra.etoka@googlemail.com
E. Gérard
Affiliation:
GEPI, Observatoire de Paris, Meudon, France, email: eric.gerard@obspm.fr
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Abstract

Since 2013, we are performing with the Nancay Radio Telescope (NRT) a monitoring program of > 100 Galactic disk OH/IR stars, having bright 1612-MHz OH maser emission. The variations of the maser emission are used to probe the underlying stellar variability. We wish to understand how the large-amplitude variations are lost during the AGB – post-AGB transition. The fading out of pulsations with steadily declining amplitudes seems to be a viable process.

Type
Contributed Papers
Copyright
© International Astronomical Union 2019 

References

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