2002AJ....123.1013L

We present absolute photometric observations in uvbyβ and 5759 differential observations in the V filter (the most complete light curve ever obtained) measured by a robotic telescope, as well as radial velocities from spectroscopic observations of the detached, eccentric, 2.3 day, double-lined, eclipsing binary star WW Camelopardalis. Absolute dimensions of the components are determined with high precision (better than 1% in the masses and radii) for the purpose of testing various aspects of theoretical modeling. We obtain 1.920±0.013 M_☉ and 1.911±0.016 R_☉ for the primary, and 1.873±0.018 M_☉ and 1.808±0.014 R_☉ for the secondary. The effective temperatures and interstellar reddening of the stars are accurately determined from new uvbyβ photometry: 8350±135 K for the primary and 8240±135 K for the secondary, corresponding to a spectral type of A4m for both, and 0.294 mag for E_b-y_. The metallic-lined character of the stars is revealed by high-resolution spectroscopy and uvbyβ photometry. Spectral line widths give rotational velocities that are synchronous with the orbital motion in a slightly eccentric orbit (e=0.0098). The components of WW Cam are main-sequence stars with an age of about 490 Myr according to models.