Self-excited Pulsations of AGB and RGB Stars in Global 3D Models
| Main Authors: | Arief Ahmad, Bernd Freytag, Susanne Höfner |
|---|---|
| Format: | Proceeding poster Journal |
| Terbitan: |
, 2021
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6372410 |
Daftar Isi:
- Recent 3D simulations of cool giants and supergiants with the CO5BOLD radiation-hydrodynamics code cover a wider range of stellar parameters and with greater temporal and spatial resolution than before. These global 3D models produce self-excited pulsations in asymptotic giant branch (AGB) and red supergiant (RSG) stars. In such evolved stars, the pulsations play a major role in developing massive outflows. The analyses of the pulsation properties and excitation mechanisms contribute crucially to our understanding of the stellar outflows associated with AGB and RSG stars. The fundamental pulsation frequency and other important pulsation parameters can be derived from the 3D models. This poster presents how to extract the fundamental frequency and the difficulties involved. With the extracted pulsation properties, a correlation was investigated between the extracted periods and the stellar parameters used as input for the 3D models, with preliminary results showing good agreement with both observations and current theoretical understanding.