Photometric elements, apsidal motion, and the third body in the eclipsing binary V974 Cygстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have derived the first photoelectric light curve of the eclipsing binary V974 Cyg from our own photoelectric observations. Analysis of the light curve has yielded the system's photometric elements ( r 1 ≈ r 2 = 0.1192, e = 0.058, L 1 ≈ L 2 = 0.486, and L 3 = 0.028) and absolute parameters ( M 1 ≈ M 2 = 2.2 M sun, T eff,1 ≈ T eff,2 = 9500 K, a = 15.0 R sun, distance d = 1.29 kpc, age log t = 8.0, t/tMS = 0.11). We have detected apsidal motion with the period U obs = (1140 ± 170) yrs, and the presence of a third body in the system. The orbital parameters derived for the third body are P 3 = 26.5 yrs, e 3 = 0.78, and a 3 sin i 3 = 1.5 AU; and the lower limit for its mass is M 3 > 0.58 M sun. The observed apsidal-motion rate is higher than is expected theoretically by a factor of 1.5. The axial rotation of the system's components is not yet synchronized with the orbital motion, probably because V974 Cyg is relatively young and detached.