Аннотация и ключевые слова
Аннотация (русский):
In this paper we investigate the periodic variability of the magnetic field of the magnetic Ap star 33 Lib. The period of 83.5 years found by us earlier from the magnetic field estimates and 79.2 years determined later are close to the period of variability of the magnetic field of the known Ap star $\gamma$ Equ of 97 years. Such a slow rotation is also confirmed by a very small value of the projection of the equatorial velocity onto the line of sight $v_e \sin i = 0.6$ km/s.

Ключевые слова:
stars: magnetic field; individual: 33 Lib
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