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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2510.26250 |
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| _version_ | 1866914124161613824 |
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| author | Liu, Zhongyang Jeffery, C. Simon Zhang, Xianfei Bi, Shaolan Li, Tanda |
| author_facet | Liu, Zhongyang Jeffery, C. Simon Zhang, Xianfei Bi, Shaolan Li, Tanda |
| contents | We present theoretical predictions of the born-again scenario for post-asymptotic giant-branch stars. An extensive model grid for born-again objects has been constructed, particularly including models for the Very Late Thermal Pulse with and without convective overshooting, and also including models for the Late Thermal Pulse. We constructed a large parameter space to analyze the dependencies of the born-again model on core mass, hydrogen-envelope mass, and overshoot parameters, and we analyzed how changes in these parameters affect the models' evolution. We applied our grid of models to interpret observations of DY\,Cen, a star exhibiting characteristics similar to confirmed born-again stars. We compared DY\,Cen with models from multiple aspects, including heating rate, evolutionary tracks, and surface abundances. Ultimately, we concluded that none of our born-again models could match all of the observed properties of DY\,Cen, especially its surface chemistry; DY\,Cen is therefore an unlikely born-again star. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_26250 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Theoretical models for the Late Thermal Pulse in post-AGB stars: the case of DY Cen Liu, Zhongyang Jeffery, C. Simon Zhang, Xianfei Bi, Shaolan Li, Tanda Solar and Stellar Astrophysics We present theoretical predictions of the born-again scenario for post-asymptotic giant-branch stars. An extensive model grid for born-again objects has been constructed, particularly including models for the Very Late Thermal Pulse with and without convective overshooting, and also including models for the Late Thermal Pulse. We constructed a large parameter space to analyze the dependencies of the born-again model on core mass, hydrogen-envelope mass, and overshoot parameters, and we analyzed how changes in these parameters affect the models' evolution. We applied our grid of models to interpret observations of DY\,Cen, a star exhibiting characteristics similar to confirmed born-again stars. We compared DY\,Cen with models from multiple aspects, including heating rate, evolutionary tracks, and surface abundances. Ultimately, we concluded that none of our born-again models could match all of the observed properties of DY\,Cen, especially its surface chemistry; DY\,Cen is therefore an unlikely born-again star. |
| title | Theoretical models for the Late Thermal Pulse in post-AGB stars: the case of DY Cen |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.26250 |