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We present the first modern analysis of two young, eclipsing binaries, EK Cepand HS Her, based on new, ground-based, CCD multicolour light curves as well asthe TESS observations, radial velocity curves, and eclipse timing measurements.The orbital and stellar parameters of the stars are determined by Rochemodelling, and their evolutionary status is examined using a grid of isochronesand evolutionary tracks. We find that HS Her is 25-32 Myr old and itscomponents are on the zero-age main sequence; at the age of 16-20 Myr, theprimary of EK Cep is also on the ZAMS, but its secondary is a pre-main-sequencestar. Both binaries have slightly eccentric orbits and display apsidal motion.Based on updated eclipse timings and spectroscopic evidence, we rule out thepresence of a previously hypothesized tertiary component in HS Her.

Eccentric orbits and apsidal motion in the eclipsing binaries EK Cep and HS Her