Contact-binary evolution with energy transfer and saturated magnetic braking
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866915565653721088 |
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| author | Fabry, Matthias Prša, Andrej |
| author_facet | Fabry, Matthias Prša, Andrej |
| contents | The evolution of low-mass contact binaries is influenced by angular-momentum loss, mass and energy transfer, and the nuclear evolution of the components. They have periods shorter than one day, and we expect their period evolution to be dominated by magnetic braking. Evidence for saturated magnetic braking was presented by studying the period distribution of detached eclipsing binaries. This means the strength of magnetic braking likely does not cause a steep period-shrinking relation derived from the widely used Skumanich law. We find further evidence for saturated magnetic braking by considering evolutionary models of low-mass contact binaries. We also show that energy transfer must play an important role over a wide parameter range in producing the observed low mass ratios of contact binaries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_17963 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Contact-binary evolution with energy transfer and saturated magnetic braking Fabry, Matthias Prša, Andrej Solar and Stellar Astrophysics The evolution of low-mass contact binaries is influenced by angular-momentum loss, mass and energy transfer, and the nuclear evolution of the components. They have periods shorter than one day, and we expect their period evolution to be dominated by magnetic braking. Evidence for saturated magnetic braking was presented by studying the period distribution of detached eclipsing binaries. This means the strength of magnetic braking likely does not cause a steep period-shrinking relation derived from the widely used Skumanich law. We find further evidence for saturated magnetic braking by considering evolutionary models of low-mass contact binaries. We also show that energy transfer must play an important role over a wide parameter range in producing the observed low mass ratios of contact binaries. |
| title | Contact-binary evolution with energy transfer and saturated magnetic braking |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.17963 |