Changes in R Leonis over Two Centuries: Period evolution and dust shell development
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915693511835648 |
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| author | Goldsmith, Mike |
| author_facet | Goldsmith, Mike |
| contents | The AAVSO-based historical light curve of the oxygen-rich Mira variable R Leonis is used to determine and analyse the properties of the star's maxima and minima. The pulsation period is found to have shortened by about 3 days over the past two centuries. Superimposed on the mean period are clear modulations on timescales of approximately 35 and 98 years. The depths of extrema show non-random behaviour: minima in particular display strong similarity in depth over extended intervals, with a mean depth difference of 0.26 magnitude for adjacent minima compared to a 0.38 magnitude difference for random pairs. Depth coherence persists for up to about 43 years. Examination of extrema depths over the full observational history of the star reveals gradual long-term changes, consistent with evolution of the circumstellar dust environment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21296 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Changes in R Leonis over Two Centuries: Period evolution and dust shell development Goldsmith, Mike Solar and Stellar Astrophysics The AAVSO-based historical light curve of the oxygen-rich Mira variable R Leonis is used to determine and analyse the properties of the star's maxima and minima. The pulsation period is found to have shortened by about 3 days over the past two centuries. Superimposed on the mean period are clear modulations on timescales of approximately 35 and 98 years. The depths of extrema show non-random behaviour: minima in particular display strong similarity in depth over extended intervals, with a mean depth difference of 0.26 magnitude for adjacent minima compared to a 0.38 magnitude difference for random pairs. Depth coherence persists for up to about 43 years. Examination of extrema depths over the full observational history of the star reveals gradual long-term changes, consistent with evolution of the circumstellar dust environment. |
| title | Changes in R Leonis over Two Centuries: Period evolution and dust shell development |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2512.21296 |