The intriguing orbital period variability of Y Leonis |
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| Authors: | Alexandru Pop Vlad Turcu Alexandru Marcu |
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| Institution: | (1) Astronomical Observatory Cluj-Napoca, Astronomical Institute of the Romanian Academy, Str. Cire ilor 19, RO-3400 Cluj-Napoca, Romania;(2) Faculty of Chemistry and Chemical Engineering, Babe-Bolyai University, Str. Arany Janos 11, RO-3400 Cluj-Napoca, Romania |
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| Abstract: | The orbital period variation of the oEA system Y Leo is revised by taking into account new times of minimum light covering
an extended time base of 101.8 yr. A multiperiodic ephemeris was finally established by carefully approaching the problem of periodicity detection for the considered periodic
components. A method relying on Monte Carlo simulations was applied. The problem of the long-term behaviour of the O–C curve was taken into account using parabolic, and parabolic + periodic ephemerides. The physical interpretation of the mathematical models describing both long- and short-term behaviour of the
O–C curve was performed by considering different mechanisms: the conservative mass transfer, the light-time effect, and the orbital
period modulation through the cyclic magnetic activity of the late spectral type secondary component in the system. The consequences
of these interpretations are rather intriguing and emphasize the need of new and detailed observational studies on Y Leo. |
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