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What apsidal motion reveals about the interior of massive binary stars

Apart from asteroseismology, the most efficient observational technique allowing to probe the internal structure of a star is the determination of the apsidal motion in close eccentric binary systems. This secular precession of the major axis of the bi-nary orbit depends on the tidal interactions between the two stars. The rate of this motion is di...

Carbon-enhanced metal-poor stars enriched in s-process and r-process elements

Published in Journal of Astrophysics and Astronomy

We present an on-going project consisting of analysis of a sample of twenty-five metal-poor stars, most of them carbon-enriched and thus tagged carbon-enhanced metal-poor (CEMP) stars, observed with the high-resolution HERMES spectrograph mounted on the Mercator telescope (La Palma), the UVES spectrograph on VLT (ESO Chile), or the HIRES spectrogra...

Apsidal motion in the massive binary HD 152248: Constraining the internal structure of the stars

Context. Apsidal motion in massive eccentric binaries offers precious information about the internal structure of the stars. This is especially true for twin binaries consisting of two nearly identical stars. Aims. We make use of the tidally induced apsidal motion in the twin binary HD 152248 to infer constraints on the internal structure of the O7...