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A Comprehensive Study of the Eclipsing Binaries V1241 Tau and GQ Dra

Ulaş B., Gazeas K., Liakos A., Ulusoy C., Stateva I., Erkan N., Napetova M., Iliev I. K.

Acta Astronomica

2020

Vol. 70, No. 3

219--240

We present new photometric and spectroscopic observations and analyses for the eclipsing binary systems V1241 Tau and GQ Dra. Our photometric light and radial velocity curve analyses combined with the TESS light curves show that both are conventional semi-detached binary systems. Their absolute parameters are also derived. We present the O-C analyses of the systems and we propose the most likely orbital period modulating mechanisms. Furthermore, Fourier analyses are applied to the photometric residual data of the systems to check for the pulsational behavior of the components. We conclude that the primary component of the system GQ Dra is a δ Sct type pulsator with a dominant pulsation frequency of 18.58 d-1 based on our B filter residual light curve although it can not be verified by 30-minute cadence TESS data. No satisfactory evidence of pulsational behavior for V1241 Tau was verified. Finally, the evolutionary tracks of the components of both systems are calculated. Their locations within evolutionary diagrams are compared with other Algol-type systems.

Investigation of a high-forced cooling system for the elements of heat power installations

Genbach A. A., Bondartsev D. Y., Iliev I. K.

Journal of Machine Engineering

2018

Vol. 18, No. 2

106--117

The studies of the ultimate thermal flows have been carried out in metallic and poorly heat-conducting porous structures, which operate when gravitational and capillary forces act jointly and cool various devices of thermal power plants in order to create a scientific methodology. The mechanism of destruction of metal vaporizing surfaces and poorly heat-conducting coatings of low porosity made of natural mineral media (granite) has been described on the basis of the problem of thermoelasticity and experimental data. Thermal flow dependences on time of their action and depth of penetration of temperature perturbations were identified based on analogy. Capillary-porous systems have high intensity, heat transport ability, reliability, compactness. The results of calculations and experiment showed that the maximum thickness of the particles that detach under the influence of compression forces for granite coatings is (0.25÷0.3).10-2 m. Sections of compression curves that determine the detachment of particles with dimensions of more than 0.3×10-2 m for large thermal flows and short feed times, are screened by the melting curve, and in the case of small thermal flows and time intervals – the expansion curve.