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Signatures of wind formation in optical spectra of precursors of planetary nebulae

Published online by Cambridge University Press:  16 August 2023

Kārlis Puķītis Open the ORCID record for Kārlis Puķītis [Opens in a new window]  and
Laimons Začs
Kārlis Puķītis
Affiliation:
Laser Center, Faculty of Physics, Mathematics, and Optometry, University of Latvia, Raiṇa bulvāris 19, LV-1586 Rīga, Latvia
Laimons Začs
Affiliation:
Laser Center, Faculty of Physics, Mathematics, and Optometry, University of Latvia, Raiṇa bulvāris 19, LV-1586 Rīga, Latvia
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Abstract

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Generally it is thought that shaping of planetary nebula from initially spherical envelope of asymptotic giant branch stars into non-spherical morphologies is a consequence of binary interactions. However, post asymptotic giant branch stars HD 235858 and HD 161796 seem to be at odds with this idea and perhaps the non-spherical nebulae surrounding them arose from intrinsic change in the nature of the stellar wind which is poorly understood for this evolutionary phase. Spectroscopic monitoring of these two stars has revealed signatures in the spectra that point to variable outflow. This indicates the prospect of spectroscopic monitoring to advance the knowledge of wind launching mechanism in post asymptotic giant branch stars and other dynamical processes in their extended atmospheres.

Keywords

stars: AGB and post-AGBstars: atmospheresstars: windsoutflowsstars: individual (HD 235858, HD 161796)
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 287 - 288
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

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