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Abstract: Tightest known quadruple systems VW LMi consists of contact eclipsing binarywith P 12 = 0.477551 days and detached binary with P 34 = 7.93063 daysrevolving in rather tight, 355.0-days orbit. This paper presents newphotometric and spectroscopic observations yielding 69 times of minima and 36disentangled radial velocities for the component stars. All available radialvelocities and minima times are combined to better characterize the orbits andto derive absolute parameters of components. The total mass of the quadruplesystem was estimated at 4.56 M sun. The detached, non-eclipsing binary withorbital period P = 7.93 days is found to show apsidal motion with Uapproximately 80 years. Precession period in this binary, caused by thegravitational perturbation of the contact binary, is estimated to be about 120years. The wide mutual orbit and orbit of the non-eclipsing pair are found tobe close to coplanarity, preventing any changes of the inclination angle of thenon-eclipsing orbit and excluding occurrence of the second system of eclipsesin future. Possibilities of astrometric solution and direct resolving of thewide, mutual orbit are discussed. Nearby star, HD95606, was found to form loosebinary with quadruple system VW LMi.



Author: T. Pribulla, D. Baludansky, P. Dubovsky, I. Kudzej, S. Parimucha, M. Siwak, M. Vanko

Source: https://arxiv.org/



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