New Value of Apsidal Motion Velocity and Physical Parameters of the Triple Eclipsing System AS Cam

Abstract

Applying a new approach to the measurement of the rate of apsidal motion in the system AS Cam ($P{{ = 3.43}^{d}}$_, $V{{ = 8.58}^{m}}$, $e = 0.17$, Sp B7.5 V+B9.0 V), we obtained the value ${{\dot {\omega }}_{{{\text{obs}}}}}$= 0.38°/yr, which is not as large as results of earlier measurements differs from the theoretical value for synchronized motion ${{\dot {\omega }}_{{{\text{theor}}}}}$ = 0.44°/yr. Previous generally accepted value was three times lower. Physical parameters of the components have been refined: ${{T}_{1}} = 12{\kern 1pt} {\kern 1pt} 980 \pm 150$ K, ${{M}_{1}} = 3.21 \pm 0.03\,{{M}_{ \odot }}$, ${{R}_{1}} = 2.46 \pm 0.01\;{{R}_{ \odot }}$, ${{T}_{2}} = 10{\kern 1pt} {\kern 1pt} 850 \pm 100$ K, M₂ = 2.32 ± $0.03\;{{M}_{ \odot }}$, ${{R}_{2}} = 1.84 \pm 0.01\;{{R}_{ \odot }}$. For the first time, a reliable orbit and physical parameters of the invisible sa-tellite, the third body in the system, have been determined: $P = 2.21$ yr, ω = 88°, $e = 0.70$, ${{M}_{3}}\sin i = 0.97 \pm 0.01\,{{M}_{ \odot }}$.