OO Leo: An Active Contact Binary with Possible Solar-like Differential Rotation Article Swipe
Zi-Bin Meng
,
Pei-Ru Wu
,
Yun-Xia Yu
,
Ke Hu
,
Fu-Yuan Xiang
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/ad571e
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/ad571e
With Transiting Exoplanet Survey Satellite (TESS) high-precision photometry and Large Sky Area Multi-object Fiber Spectroscopic Telescope medium-resolution spectra, we present the first light and radial velocity curve analyses for the eclipsing binary OO Leo. The simultaneous solution suggests that OO Leo is a W-subtype contact binary with a relatively low mass ratio (1/ q = 0.173) and a moderate degree of contact ( f = 28.1%). The asymmetry and continuous changes observed in the TESS light curve were properly modeled by one retrograde cool spot on its secondary surface. A detailed investigation of the H α line also confirmed that the secondary star had a high level of magnetic activity. The retrograde longitudinal motion of the spot can be explained by a solar-like differential rotation in the secondary component. The orbital period investigation revealed that OO Leo is undergoing a secular decrease and a cyclic variation in its orbital period. The secular decrease may be mainly caused by mass transfer from the more massive secondary star to the less massive primary star. The cyclic period variation can be explained by the light–time effect of an invisible third body or the cyclic magnetic activity of the secondary star. The long-lived spot migration in the longitudinal direction makes OO Leo an excellent target for investigating the differential rotations of contact binaries.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3847/1538-4357/ad571e
- OA Status
- gold
- Cited By
- 5
- References
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- Related Works
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- OpenAlex ID
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All OpenAlex metadata
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https://openalex.org/W4401466903Canonical identifier for this work in OpenAlex
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https://doi.org/10.3847/1538-4357/ad571eDigital Object Identifier
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OO Leo: An Active Contact Binary with Possible Solar-like Differential RotationWork title
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articleOpenAlex work type
- Language
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enPrimary language
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2024Year of publication
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2024-08-01Full publication date if available
- Authors
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Zi-Bin Meng, Pei-Ru Wu, Yun-Xia Yu, Ke Hu, Fu-Yuan XiangList of authors in order
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https://doi.org/10.3847/1538-4357/ad571ePublisher landing page
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://doi.org/10.3847/1538-4357/ad571eDirect OA link when available
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Physics, Differential rotation, Contact binary, Binary number, Rotation (mathematics), Astronomy, Differential (mechanical device), Astrophysics, Binary star, Stars, Geometry, Thermodynamics, Mathematics, ArithmeticTop concepts (fields/topics) attached by OpenAlex
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5Total citation count in OpenAlex
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2025: 4, 2024: 1Per-year citation counts (last 5 years)
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