SIMBAD references

We present UBVRI photometric measurements and spectroscopic observations of the double-lined eclipsing binary V821Cas. The radial velocities were obtained by means of the cross-correlation technique. Simultaneous analyses of the multiband light curves and RVs give the absolute parameters for the stars as: and. An analysis of the O-C residuals yielded an apsidal motion in the binary at a rate of, corresponding to an apsidal period of U = 118±19yr. Subtracting the relativistic contribution, we find that logk_2obs= -2.590 which is in agreement with the value predicted by theoretical models. Comparison with current stellar evolution models gives an age of 5.6x10⁸yr for the system.