[PDF] Modeling contact binaries, II. The effect of energy transfer-论文阅读讨论-ReadPaper

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Context. It is common for massive stars to engage in binary interaction. Inclose binaries, the components can enter a contact phase, where both starsoverflow their respective Roche lobes simultaneously. While there existobservational constraints on the stellar properties of such systems, the mostdetailed stellar evolution models that feature a contact phase are not fullyreconcilable with those measurements. Aims. We aim to consistently modelcontact phases of binary stars in a 1D stellar evolution code. To this end, wedevelop the methodology to account for energy transfer in the common contactlayers. Methods. We implement an approximative model for energy transferbetween the components of a contact binary based on the von Zeipel theorem inthe stellar evolution code MESA. We compare structure and evolution models withand without this transfer and analyze the implications for the observableproperties of the contact phase. Results. Implementing energy transfer helpseliminating baroclinicity in the common envelope between the components of acontact binary, which, if present, would drive strong thermal flows. We findthat accounting for energy transfer in massive contact binaries significantlyalters the mass ratio evolution and can extend the lifetime of an unequal massratio contact system.

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