We report extensive high-resolution spectroscopic observations and V -band differential photometry of the slightly eccentric 7.02-day 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 \pm 0.0043 ~ { } M _ { \sun } , R _ { A } = 1.888 \pm 0.029 ~ { } R _ { \sun } , and T _ { eff } ^ { A } = 7510 \pm 100 K for the primary and M _ { B } = 1.4588 \pm 0.0025 ~ { } M _ { \sun } , R _ { B } = 1.592 \pm 0.028 ~ { } R _ { \sun } , and T _ { eff } ^ { B } = 7000 \pm 90 K 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 \pm 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 1.1 Gyr .