naa a22 4500 510732151 CHVBK 20180411082956.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1134/S1063772913060024 doi (NATIONALLICENCE)springer-10.1134/S1063772913060024 Orbital-period variations in the eclipsing binary Y Cam [Elektronische Daten] [Kh. Khaliullin, A. Khaliullina] We have studied the time behavior of the orbital period and the primary's pulsation period for the eclipsing binary system Y Cam, whose secondary fills its Roche lobe and whose primary is a δ Scuti star. The times of minima available for this eclipsing binary cover 120 years. δ Scuti pulsations of the primary have been observed over the last 50 years, with the period of these pulsational brightness variations remaining virtually unchanged during the entire observed time interval. The large-amplitude cyclic variations of the orbital period of Y Cam cannot be explained solely by the presence of a third body in the system. It is possible to explain the period variations of Y Cam with magnetic oscillations or a superposition of a stationary matter flow from the lower-mass to the higher-mass component together with magnetic oscillations, similar to the case of AB Cas. A good agreement with observations is provided by a model assuming a stationary matter flow from the secondary filling its Roche lobe to the primary, at the rate of 2.85 × 10−7 M ⊙/year, superposed with irregular period jumps that can be explained by instabilities in the matter flow. We have detected cyclic variations of the orbital period of Y Cam with an amplitude of 0.011d, which can be understood if the binary moves in a long-period orbit (with a period of 38.6 years) around a third body with mass M 3 s> 0.30M ⊙. These cyclic period variations of the eclipsing binary agree with the observed small period variations of the δ Scuti pulsations. Pleiades Publishing, Ltd., 2013 Khaliullin Kh LomonosovMoscow State University, Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut Khaliullina A. LomonosovMoscow State University, Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut Astronomy Reports Springer US; http://www.springer-ny.com 57/7(2013-07-01), 517-526 1063-7729 57:7<517 2013 57 11444 https://doi.org/10.1134/S1063772913060024 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913060024 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khaliullin Kh LomonosovMoscow State University, Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut NATIONALLICENCE 700 1- Khaliullina A. LomonosovMoscow State University, Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut NATIONALLICENCE 773 0- Astronomy Reports Springer US; http://www.springer-ny.com 57/7(2013-07-01), 517-526 1063-7729 57:7<517 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer