Mode identification revisit and asteroseismology of the DAV star TIC 231277791
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| Format: | Preprint |
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2025
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| _version_ | 1866908299029381120 |
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| author | Yao, Zhikao Chen, Yanhui Tang, Mengyao |
| author_facet | Yao, Zhikao Chen, Yanhui Tang, Mengyao |
| contents | White dwarfs are the final stage for most low and intermediate mass stars, which plays an important role in understanding stellar evolution and galactic history. Here we performed an asteroseismological analysis on TIC 231277791 based on 10 independent modes reported by Romero et al. Two groups of modes were identified with frequency splitting: mode identification$\_{1}$ with one $l$\,=\,1, $m$\,=\,0 mode, two $l$\,=\,2, $m$\,=\,0 modes, and three $l$\,=\,1 or 2, $m$\,=\,0 modes, and mode identification$\_{2}$ wtih one $l$\,=\,1, $m$\,=\,0 mode, three $l$\,=\,2, $m$\,=\,0 modes, and one $l$\,=\,1 or 2, $m$\,=\,0 mode. The rotation period is derived to be 41.64\,$\pm$\,2.73\,h for TIC 231277791. We established a large sample (7,558,272) of DAV star models using the White Dwarf Evolution Code (\texttt{WDEC}; 2018, v16), resulting of optimal models with model$\_{1}$ (mode identification$\_{1}$): $M_\mathrm{*}$\,=\,0.570\,$\pm$\,0.005\,$M_\mathrm{\odot}$, $T_\mathrm{eff}$\,=\,11300\,$\pm$\,10\,K, -log($M_\mathrm{H}/M_\mathrm{*}$)\,=\,9.15\,$\pm$\,0.01, -log($M_\mathrm{He}/M_\mathrm{*}$)\,=\,4.94\,$\pm$\,0.01, and $σ_{\textup{RMS}}$\,=\,0.06\,s, and model$\_{2}$ (mode identification$\_{2}$): $M_\mathrm{*}$\,=\,0.720\,$\pm$\,0.005\,$M_\mathrm{\odot}$, $T_\mathrm{eff}$\,=\,11910\,$\pm$\,10\,K, -log($M_\mathrm{H}/M_\mathrm{*}$)\,=\,6.11\,$\pm$\,0.01, -log($M_\mathrm{He}/M_\mathrm{*}$)\,=\,3.09\,$\pm$\,0.01, and $σ_{\textup{RMS}}$\,=\,0.04\,s. The central oxygen abundances are 0.71 (optimal model$\_{1}$) and 0.72 (optimal model$\_{2}$), respectively, which are consistent with the results of stellar structure and evolution theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_02308 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mode identification revisit and asteroseismology of the DAV star TIC 231277791 Yao, Zhikao Chen, Yanhui Tang, Mengyao Solar and Stellar Astrophysics White dwarfs are the final stage for most low and intermediate mass stars, which plays an important role in understanding stellar evolution and galactic history. Here we performed an asteroseismological analysis on TIC 231277791 based on 10 independent modes reported by Romero et al. Two groups of modes were identified with frequency splitting: mode identification$\_{1}$ with one $l$\,=\,1, $m$\,=\,0 mode, two $l$\,=\,2, $m$\,=\,0 modes, and three $l$\,=\,1 or 2, $m$\,=\,0 modes, and mode identification$\_{2}$ wtih one $l$\,=\,1, $m$\,=\,0 mode, three $l$\,=\,2, $m$\,=\,0 modes, and one $l$\,=\,1 or 2, $m$\,=\,0 mode. The rotation period is derived to be 41.64\,$\pm$\,2.73\,h for TIC 231277791. We established a large sample (7,558,272) of DAV star models using the White Dwarf Evolution Code (\texttt{WDEC}; 2018, v16), resulting of optimal models with model$\_{1}$ (mode identification$\_{1}$): $M_\mathrm{*}$\,=\,0.570\,$\pm$\,0.005\,$M_\mathrm{\odot}$, $T_\mathrm{eff}$\,=\,11300\,$\pm$\,10\,K, -log($M_\mathrm{H}/M_\mathrm{*}$)\,=\,9.15\,$\pm$\,0.01, -log($M_\mathrm{He}/M_\mathrm{*}$)\,=\,4.94\,$\pm$\,0.01, and $σ_{\textup{RMS}}$\,=\,0.06\,s, and model$\_{2}$ (mode identification$\_{2}$): $M_\mathrm{*}$\,=\,0.720\,$\pm$\,0.005\,$M_\mathrm{\odot}$, $T_\mathrm{eff}$\,=\,11910\,$\pm$\,10\,K, -log($M_\mathrm{H}/M_\mathrm{*}$)\,=\,6.11\,$\pm$\,0.01, -log($M_\mathrm{He}/M_\mathrm{*}$)\,=\,3.09\,$\pm$\,0.01, and $σ_{\textup{RMS}}$\,=\,0.04\,s. The central oxygen abundances are 0.71 (optimal model$\_{1}$) and 0.72 (optimal model$\_{2}$), respectively, which are consistent with the results of stellar structure and evolution theory. |
| title | Mode identification revisit and asteroseismology of the DAV star TIC 231277791 |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2504.02308 |