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| Format: | Preprint |
| Published: |
2026
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| Online Access: | https://arxiv.org/abs/2604.26710 |
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| _version_ | 1866911702988095488 |
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| author | Rucinski, S. M. |
| author_facet | Rucinski, S. M. |
| contents | Analysis of 28 years of OGLE project data for the 0.404 day period binary OGLE BLG ELL-006503 (V1231 Sco) shows a superposition of tidal-interaction variations of about 0.07 magnitude in the I-band onto a time-scale 5-10 year, 0.15-0.17 magnitude brightness drift. Seasonal light-curves suggest that this long-term variability is driven by large photospheric spots (approx 0.3 stellar radii) that exhibit a tendency to orient themselves relative to the tidal interaction line. The eclipse time O-C residuals reveal an orbital period change characterized by a timescale of approximately 2x10^6 years, suggesting a mild mass redistribution, potentially linked to global magnetic fields reconfiguration. Gaia parallax and absolute magnitude estimates indicate a system consisting of solar-type stars. The lack of eclipses and extreme spot activity suggest the binary may consist of late-type, tidally-deformed stars rather than a typical W UMa-type system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26710 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A short-period binary OGLE-BLG-ELL-006503 showing slow variations in brightness Rucinski, S. M. Solar and Stellar Astrophysics Analysis of 28 years of OGLE project data for the 0.404 day period binary OGLE BLG ELL-006503 (V1231 Sco) shows a superposition of tidal-interaction variations of about 0.07 magnitude in the I-band onto a time-scale 5-10 year, 0.15-0.17 magnitude brightness drift. Seasonal light-curves suggest that this long-term variability is driven by large photospheric spots (approx 0.3 stellar radii) that exhibit a tendency to orient themselves relative to the tidal interaction line. The eclipse time O-C residuals reveal an orbital period change characterized by a timescale of approximately 2x10^6 years, suggesting a mild mass redistribution, potentially linked to global magnetic fields reconfiguration. Gaia parallax and absolute magnitude estimates indicate a system consisting of solar-type stars. The lack of eclipses and extreme spot activity suggest the binary may consist of late-type, tidally-deformed stars rather than a typical W UMa-type system. |
| title | A short-period binary OGLE-BLG-ELL-006503 showing slow variations in brightness |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2604.26710 |