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- W3105471318 abstract "The complexity of composite spectra of close binary star system makes study of the spectra of their component stars extremely difficult. For this reason there exists very little information on the photospheric chemical composition of stars in close binaries, despite its importance for informing our understanding of the evolutionary processes of stars. In a long-term observational project we aim to fill this gap with systematic abundance studies for the variety of binary systems. The core of our analysis is the spectral disentangling technique, which allows isolation of the individual component star spectra from the time-series of observed spectra. We present new results for high-mass stars in close binaries. So far, we have measured detailed abundances for 22 stars in a dozen detached binary systems. The parameter space for the stars in our sample comprises masses in the range 8--22 M_sun, surface gravities of 3.1--4.2 (c.g.s.) and projected rotational velocities of 30--240 km/s. Whilst recent evolutionary models for rotating single stars predict changes in photospheric abundances even during the main sequence lifetime, no star in our sample shows signs of these predicted changes. It is clear that other effects prevail in the chemical evolution of components in binary stars even at the beginning of their evolution." @default.
- W3105471318 created "2020-11-23" @default.
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- W3105471318 date "2013-01-01" @default.
- W3105471318 modified "2023-10-16" @default.
- W3105471318 title "Probing the models: Abundances for high-mass stars in binaries" @default.
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- W3105471318 doi "https://doi.org/10.1051/eas/1364004" @default.
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