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Description
We report extensive high-resolution spectroscopic observations and V-band differential photometry of the slightly eccentric 7.02day detached eclipsing binary V501 Mon (A6m+F0), which we use to determine its absolute dimensions to high precision (0.3% for the masses and 1.8% for the radii, or better). The absolute masses, radii, and temperatures are M_A_=1.6455+/-0.0043M_{sun}_, R_A_=1.888+/-0.029R_{sun}_, and T_eff_^A^=7510+/-100K for the primary and M_B_=1.4588+/-0.0025M_{sun}_, R_B_=1.592+/-0.028R_{sun}_, and T_eff_^B^=7000+/-90K for the secondary. Apsidal motion has been detected, to which General Relativity contributes approximately 70%. The primary star is found to be a metallic-line A star. A detailed chemical analysis of the disentangled spectra yields abundances for more than a dozen elements in each star. Based on the secondary, the system metallicity is near solar: [Fe/H]=+0.01+/-0.06. Lithium is detected in the secondary but not in the primary. A comparison with current stellar evolution models shows a good match to the measured properties at an age of about 1.1Gyr.
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