Dynamics of extended AGB star envelopes
C. Dreyer, M. Hegmann, and E. Sedlmayr
TL;DR
This paper investigates how dust formation influences the dynamics of extended AGB star envelopes, revealing a radiatively driven instability that results in autonomous oscillations and examining the interaction with stellar pulsations.
Contribution
It introduces a detailed analysis of dust-driven instabilities and their role in the complex dynamics of AGB star envelopes, highlighting the interplay with stellar pulsations.
Findings
Dust formation causes a radiatively driven instability.
The instability leads to autonomous envelope oscillations.
External stellar pulsations interact with the envelope's internal dynamics.
Abstract
The dust formed in extended circumstellar envelopes of long-period variables and Miras has a strong influence on the envelope dynamics. A radiatively driven instability caused by the formation of dust leads to the development of an autonomous dynamics characterised by a set of distinct frequencies. We study the interplay between the envelope's internal dynamics and an external excitation by a pulsating star.
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Astronomy and Astrophysical Research