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| Format: | Preprint |
| Veröffentlicht: |
2024
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| Online-Zugang: | https://arxiv.org/abs/2401.09046 |
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| _version_ | 1866917569633452032 |
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| author | Parida, Sugyan Yadav, Abhay Pratap Joshi, Santosh |
| author_facet | Parida, Sugyan Yadav, Abhay Pratap Joshi, Santosh |
| contents | In several B-type supergiants photometric and spectroscopic variabilities together with episodes of enhanced mass-loss have been observed. Here we present the preliminary results of linear stability analysis followed by nonlinear numerical simulations in two B-type supergiants MWC 137 and MWC 314. All the considered models of MWC 137 having mass in the range of 30 M$_{\odot}$ to 70 M$_{\odot}$ are unstable while for the case of MWC 314 models with mass below 31 M$_{\odot}$ are unstable. The instabilities have been followed into nonlinear regime for selected models of these two supergiants. During the nonlinear numerical simulations, instabilities lead to finite amplitude pulsation with a well defined saturation level in the considered models of MWC 137 with mass greater than 42 M$_{\odot}$. The model of MWC 314 with mass of 40 M$_{\odot}$ - the suggested mass for the primary star - does not show any instabilities both in linear stability analysis and nonlinear numerical simulations. Velocity amplitude reaches to 10$^7$ cm/s in the nonlinear regime for the model of MWC 314 with mass of 30 M$_{\odot}$. Further extensive numerical simulations and observations are required to understand the origin of the observed variabilities in these stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_09046 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Instabilities in models of supergiants MWC 137 and MWC 314 Parida, Sugyan Yadav, Abhay Pratap Joshi, Santosh Solar and Stellar Astrophysics In several B-type supergiants photometric and spectroscopic variabilities together with episodes of enhanced mass-loss have been observed. Here we present the preliminary results of linear stability analysis followed by nonlinear numerical simulations in two B-type supergiants MWC 137 and MWC 314. All the considered models of MWC 137 having mass in the range of 30 M$_{\odot}$ to 70 M$_{\odot}$ are unstable while for the case of MWC 314 models with mass below 31 M$_{\odot}$ are unstable. The instabilities have been followed into nonlinear regime for selected models of these two supergiants. During the nonlinear numerical simulations, instabilities lead to finite amplitude pulsation with a well defined saturation level in the considered models of MWC 137 with mass greater than 42 M$_{\odot}$. The model of MWC 314 with mass of 40 M$_{\odot}$ - the suggested mass for the primary star - does not show any instabilities both in linear stability analysis and nonlinear numerical simulations. Velocity amplitude reaches to 10$^7$ cm/s in the nonlinear regime for the model of MWC 314 with mass of 30 M$_{\odot}$. Further extensive numerical simulations and observations are required to understand the origin of the observed variabilities in these stars. |
| title | Instabilities in models of supergiants MWC 137 and MWC 314 |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.09046 |