A test case of stellar evolution: the eclipsing binary EK Cephei. A system with accurate dimensions, apsidal motion rate and lithium depletion level.
EK Cep is a double-lined eclipsing binary system with unique characteristics. Accurate absolute dimensions are available, a good determination of the surface lithium abundance has been made, the system is known to show apsidal motion variations, and its secondary component seems to be in the pre main sequence phase. Due to all this, it appears to
Martin, E. L. et al.
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10
1995