Asteroseismic analysis of RY Leporis: the post-main sequence HADS in a binary system
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arXiv
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| Natura: | Preprint |
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2026
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| author | Niewiadomski, Wojciech Daszyńska-Daszkiewicz, Jadwiga Walczak, Przemysław Szewczuk, Wojciech Rodríguez, Eloy Kołaczek-Szymański, Piotr Derekas, Aliz |
| author_facet | Niewiadomski, Wojciech Daszyńska-Daszkiewicz, Jadwiga Walczak, Przemysław Szewczuk, Wojciech Rodríguez, Eloy Kołaczek-Szymański, Piotr Derekas, Aliz |
| contents | We present a comprehensive study of the pulsating primary component of the long-period binary system RY Lep. The spectral energy distribution and the absence of detectable lines indicate that the companion is likely a white dwarf. Atmospheric parameters and chemical abundances were determined from a high-resolution spectrum obtained with the the Southern African Large Telescope (SALT). The spectroscopic analysis reveals an underabundance of iron-group elements and an enhancement of neutron-capture elements, including barium and europium, with an overall metallicity of [m/H]$\approx -0.4$. In the next step, we performed the first Fourier analysis of long-term photometric data from ASAS, SuperWASP, and TESS. In the TESS observations, we identify several additional frequencies not present in the ground-based data. The dominant frequency at 4.4415 d$^{-1}$ is identified as a radial mode, most likely the first radial overtone. Finally, seismic modeling of RY Lep was carried out by fitting the dominant mode together with the secondary frequency at 6.5991 d$^{-1}$, considering two possible identification for the latter: the third radial overtone or a dipole mode. Bayesian inference based on Monte Carlo simulations yields a stellar mass of $\sim 2.0 $M$_\odot$ and an age of $\sim 730$ Myr. All viable seismic models place RY Lep in the hydrogen shell-burning evolutionary phase, with a metallicity consistent with the spectroscopic determination. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25594 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Asteroseismic analysis of RY Leporis: the post-main sequence HADS in a binary system Niewiadomski, Wojciech Daszyńska-Daszkiewicz, Jadwiga Walczak, Przemysław Szewczuk, Wojciech Rodríguez, Eloy Kołaczek-Szymański, Piotr Derekas, Aliz Solar and Stellar Astrophysics We present a comprehensive study of the pulsating primary component of the long-period binary system RY Lep. The spectral energy distribution and the absence of detectable lines indicate that the companion is likely a white dwarf. Atmospheric parameters and chemical abundances were determined from a high-resolution spectrum obtained with the the Southern African Large Telescope (SALT). The spectroscopic analysis reveals an underabundance of iron-group elements and an enhancement of neutron-capture elements, including barium and europium, with an overall metallicity of [m/H]$\approx -0.4$. In the next step, we performed the first Fourier analysis of long-term photometric data from ASAS, SuperWASP, and TESS. In the TESS observations, we identify several additional frequencies not present in the ground-based data. The dominant frequency at 4.4415 d$^{-1}$ is identified as a radial mode, most likely the first radial overtone. Finally, seismic modeling of RY Lep was carried out by fitting the dominant mode together with the secondary frequency at 6.5991 d$^{-1}$, considering two possible identification for the latter: the third radial overtone or a dipole mode. Bayesian inference based on Monte Carlo simulations yields a stellar mass of $\sim 2.0 $M$_\odot$ and an age of $\sim 730$ Myr. All viable seismic models place RY Lep in the hydrogen shell-burning evolutionary phase, with a metallicity consistent with the spectroscopic determination. |
| title | Asteroseismic analysis of RY Leporis: the post-main sequence HADS in a binary system |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2604.25594 |