Pulsations in massive and intermediate-mass binaries of interest

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ID: 331940
2026
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Abstract
Abstract We present a comprehensive observational study of seven eclipsing binaries composed of massive and intermediate-mass components. Combining ground-based spectroscopy and space photometry of target stars, we compute precise physical parameters of these systems and investigate pulsational properties of the components. Our findings indicate that primary components of all target systems are slowly pulsating B-type stars, while one of the systems includes a secondary component exhibiting δ Sct-type pulsations. Positions of the SBP components in the Hertzsprung-Russell diagram show a wide range in the efective temperature, while some of them are located beyond the hot edge of the instability strip of SPB stars. It appears that discovering a larger number of massive and intermediate-mass eclipsing binaries is required to clarify a definite instability strip for SPB stars. This also raises another question: Is an instability domain essential for SPBs?
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Authors B Hoyman, Ö Çakirli, O Özdarcan
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1923
URL
https://doi.org/10.1093/mnras/stag1923
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