Photometric elements,apsidal motion,and the third body in the eclipsing binary V974 Cyg |
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| Authors: | M V Kuznetsov Kh F Khaliullin A I Khaliullina V G Metlov L V Mossakovskaya |
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| Institution: | 1.Sternberg Astronomical Institute,Moscow State University,Moscow,Russia |
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| Abstract: | 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 = 2.2M
⊙, T
eff,1 ≈ T
eff,2 = 9500 K, a = 15.0R
⊙, 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 > 0.58M
⊙. 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. |
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| Keywords: | |
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