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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2407.06047 |
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| _version_ | 1866913421268615168 |
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| author | Morison, Adrien Saux, Arthur Le Baraffe, Isabelle Morton, Jack Guillet, Thomas Vlaykov, Dimitar Goffrey, Tom Pratt, Jane |
| author_facet | Morison, Adrien Saux, Arthur Le Baraffe, Isabelle Morton, Jack Guillet, Thomas Vlaykov, Dimitar Goffrey, Tom Pratt, Jane |
| contents | As a massive star evolves along the main sequence, its core contracts, leaving behind a stable stratification in helium. We simulate 2D convection in the core at three different stages of evolution of a $5M_{\odot}$ star, with three different stratifications in helium atop the core. We study the propagation of internal gravity waves in the stably-stratified envelope, along with the overshooting length of convective plumes above the convective boundary. We find that the stratification in helium in evolved stars hinders radial motions and effectively shields the radiative envelope against plume penetration. This prevents convective overshooting from being an efficient mixing process in the radiative envelope. In addition, internal gravity waves are less excited in evolved models compared to the zero-age-main-sequence model, and are also more damped in the stratified region above the core. As a result, the wave power is several orders of magnitude lower in mid- and terminal-main-sequence models compared to zero-age-main-sequence stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06047 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effects of stratification on overshooting and waves atop the convective core of $5M_{\odot}$ main-sequence stars Morison, Adrien Saux, Arthur Le Baraffe, Isabelle Morton, Jack Guillet, Thomas Vlaykov, Dimitar Goffrey, Tom Pratt, Jane Solar and Stellar Astrophysics As a massive star evolves along the main sequence, its core contracts, leaving behind a stable stratification in helium. We simulate 2D convection in the core at three different stages of evolution of a $5M_{\odot}$ star, with three different stratifications in helium atop the core. We study the propagation of internal gravity waves in the stably-stratified envelope, along with the overshooting length of convective plumes above the convective boundary. We find that the stratification in helium in evolved stars hinders radial motions and effectively shields the radiative envelope against plume penetration. This prevents convective overshooting from being an efficient mixing process in the radiative envelope. In addition, internal gravity waves are less excited in evolved models compared to the zero-age-main-sequence model, and are also more damped in the stratified region above the core. As a result, the wave power is several orders of magnitude lower in mid- and terminal-main-sequence models compared to zero-age-main-sequence stars. |
| title | Effects of stratification on overshooting and waves atop the convective core of $5M_{\odot}$ main-sequence stars |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2407.06047 |