V. S. Kozyreva

Apsidal motion in the eclipsing binary AS Cam

AbstractMulti-colourWBVR photoelectric observations of the eclipsing binary AS Cam have been carried out and the photometric elements, absolute dimensions, and the angular velocity of a periastron motion (

Photometric light curves and physical paramters of the eclipsing binary systems IT Cas, CO Cep, AI Hya with possible apsidal motions

\mathop \omega \limits^ \cdot _{obs}

Apsidal motion in the eclipsing binary system V 451 Ophiuchi

) are determined. The obtained value of

Apsidal motion in the eclipsing binary system OX Cas

\mathop \omega \limits^ \cdot _{obs}

Study of the Apsidal Motion in the Eclipsing Binary MZ Lac

is almost three times smaller than that theoretically predicted.

On the Problem of the Variability of VEGA

AbstractHighly accurate W BV R photometric measurements of the eclipsing binary HP Aur were performed in 2002–2003 with the 48-cm AZT-14 reflector at the Tien-Shan High-Altitude Observatory to determine the rate of apsidal motion. A consistent system of physical and geometrical parameters of the components and the binary as a whole has been constructed for the first time by analyzing these new measurements together with other published data: we determined their radii (R1 = 1.05R⊙, R2 = 0.82R⊙) and luminosities (L1 = 1.10L⊙, L2 = 0.46L⊙), spectral types (G2V + G8V) and surface gravities (log g1 = 4.38, log g2 = 4.51), age (t = 9.5 × 109 yr), and the distance to the binary (d = 197 pc). We detected an ultraviolet excess in the spectra of both components,