2006AJ....131.2664L

We present 6907 differential photometric observations in the V filter, as well as 52 radial velocities from spectroscopic observations of the detached, eccentric 7.97 day double-lined eclipsing binary star EY Cep. Absolute dimensions of the components are determined with high precision (less than 1% in the masses and radii) for the purpose of testing various aspects of theoretical modeling. We obtain 1.523±0.008 M_☉and 1.463±0.010 R_☉for the primary and 1.498±0.014 M_☉and 1.468±0.010 R_☉for the secondary. The effective temperatures and interstellar reddening of the stars are accurately determined from the spectra, uvbyβ, and UBV photometry: 7090±150 K for the primary and 6970±150 K for the secondary, corresponding to spectral types of F0 and F0, and 0.036 mag for the color excess E_b–y. Spectral line widths give rotational velocities that are synchronous with the mean orbital motion in a highly eccentric orbit (e=0.4429). The components of EY Cep are young main-sequence stars with an age of about 40 million years, according to models.