REASONS FOR THE SLOW APSIDAL ROTATION OF THE MASSIVE ECLIPSING STAR V1141 Cas

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High-precision photometric measurements of the unexplored eclipsing star V1141 Cas (P = 6.909d, V = 12.02m, e = 0.37, Sp B1 V) have shown that the apsidal rotation velocity, ωobs = 0.127°/yr, is two times slower than the theoretical value under the synchronism condition, ωtheor = 0.235°/yr. The physical parameters of the component stars were obtained: T1 = 23500 ± 400 K, M1 = 8.4 ± 0.5 M⊙, R1 = 4.24 ± 0.08 R⊙, T2 = 22000 ± 400 K, M2 = 7.0 ± 0.5 M⊙, R2 = 3.38 ± 0.08 R⊙. The age of the system is determined to be 7.5 min years with a solar chemical composition. The measured photometric parallax, π = 0.00031″ ± 0.00004″, is very close to the Gaia value. The interstellar extinction, Av = 2.2m, is 40 percent higher than the survey's data.

作者简介

A. Volkova

Lomonosov Moscow State University, Sternberg Astronomical Institute

Email: kravts@yandex.ru
Moscow, Russia

I. Volkov

Lomonosov Moscow State University, Sternberg Astronomical Institute

Email: hwp@yandex.ru
Moscow, Russia

S. Naroenkov

Institute of Astronomy of the Russian Academy of Sciences

Email: snaroenkov@inasan.ru
Moscow, Russia

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