CAOSP abstracts, Volume: 50, No.: 2, year: 2020

Author(s): Wolf, M.; Kučáková, H.; Zasche, P.; Šmelcer, L.; Hornoch, K.; Hoňková, K.; Juryšek, J.; Mašek, M.; Lehký, M.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 50, no. 2, p. 637-641.
Date: 3/2020
Title: Possible companions in low-mass eclipsing binaries: V380 Dra, BX Tri, and V642 Vir
Keyword(s): binaries: eclipsing, stars: late-type, stars: fundamental parameters, stars: individual (V380 Dra, BX Tri, V642 Vir)
Pages: 637 -- 641
DOI: https://doi.org/10.31577/caosp.2020.50.2.637
NASA ADS Abstract Service: 2020CoSka..50..637W
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: We present the new results of our long-term observational project to analyze the orbital period variations of low-mass eclipsing binaries. More then 200 new precise mid-eclipse times recorded with a CCD were obtained for three eclipsing binaries with short orbital periods: V380 Dra (P = 0.49^d), BX Tri (0.19^d), and V642 Vir (0.52^d). Observed-minus-calculated diagrams of the stars were analyzed using all reliable timings, and new parameters of the light-time effect were obtained. We derived for the first time the short orbital periods of possible third bodies of 10--20 years for these objects. We calculated that the minimum masses of the third component are close to 0.2 M_☉, which corresponds to the mass of M4 -- M5 red dwarfs. The multiplicity of these systems also plays an important role in the precise determination of their physical parameters.