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Orbital-period variations of the close binaries with late-type components TY Del and RY Cnc

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Abstract

A detailed study of orbital-period variations was performed for TY Del and RY Cnc, which are both Algol-type eclipsing binaries with late-type second aries; for RY Cnc, this is the first study of this kind. The period variations of both stars can be considered a superposition of a secular period increase and cyclic changes of this period. The secular period increase can be explained as the effect of a uniform transfer of mass from the lower-mass to the higher-mass component, with the total angular momentum conserved. The mass-transfer rate is about 1.25 × 10⊙ M ⊙/year for TY Del and (0.68−1.02) × 10−8 M ⊙/year for RY Cnc. The cyclic period variations of the eclipsing binaries TY Del and RY Cnc could be due to either the presence of a third body in the system or the influence of magnetic activity of the secondary.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119991, Russia

    A. I. Khaliullina

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  1. A. I. Khaliullina
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Correspondence to A. I. Khaliullina.

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Original Russian Text © A.I. Khaliullina, 2014, published in Astronomicheskii Zhurnal, 2014, Vol. 91, No. 8, pp. 634–642.

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Khaliullina, A.I. Orbital-period variations of the close binaries with late-type components TY Del and RY Cnc. Astron. Rep. 58, 545–553 (2014). https://doi.org/10.1134/S1063772914080010

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  • DOI: https://doi.org/10.1134/S1063772914080010

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