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- Title
Signposts of transitional phases on the Asymptotic Giant Branch.
- Authors
Etoka, S.
- Abstract
When low- and intermediate-mass stars pass through the Asymptotic Giant Branch (AGB) they experience dramatic changes in their circumstellar shell (CSE) influenced by their mass loss, the possible presence of a (closeby) companion and the magnetic field. Masers, well spread in this environment, provide a powerful tool to reveal the CSE changes occurring when the stars undergo a transitional phase on the AGB. These can be indirect, via for instance the modification of the pumping conditions or a direct consequence of e.g. a companion and/or of the magnetic field. Evidences of such changes have been observed towards Miras, materialized by strong - both in intensity and degree of polarisation - (OH) flaring events and towards stars believed to be transitioning from the Mira to the OH/IR phase, showing an unusual high degree of polarisation. How OH maser emission can be used as a signpost of transitional phases along the AGB is explored.
- Subjects
MASERS; CIRCUMSTELLAR matter; MAGNETIC fields; STELLAR evolution; ASYMPTOTIC giant branch stars; SOLAR flares
- Publication
Proceedings of the International Astronomical Union, 2022, Vol 18, Issue S380, p347
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921323002223