Analysis of methods for detecting and observing binary stars
Received 11.01.2021, Revised 22.03.2021, Accepted 27.04.2021
Abstract
Purpose. Consider and classify existing methods of registration and observation of binary stars. Research methods. A systematic analysis of existing methods for detecting binary systems has been carried out, today approaches have been analyzed and their features were considered. A systematic analysis of existing methods for detecting binary systems has been carried out. Current approaches have been analyzed and their features were considered. Scientific novelty. The types of binary stars that can be classified as visuals look like two separate components, the relative position of which varies through the movement along its orbits, astrometric, in which only one component with variable motion is visually noticeable, which is caused by the gravitational effect of the second component, spectroscopic, the spectra of which reveal regular changes and photometric, the periodic oscillations of the total brightness of which are caused by the movement of the components of the binary system. Practical significance. Physical binary stars represent a fundamental interest for astronomy as a science, which is largely determined by the fact that the study of double stars allowed unequivocally to establish the unity of Newton's law of worldwide gravity in the universe and gain, based on observation, fundamental knowledge of the masses of stars, their luminosity and evolution. Results. Using existing methods for detecting binary stars, it is possible to determine a large number of their parameters, regardless of the type of binary systems. According to the method of observation and detection of a particular stars system, you can use different options for finding the parameters of the stars. The change in the brightness of the system body is usually caused by a change in the relative position of the body, due to the movement of bodies in orbits, as well as the rotation of the body around its axis. In the latter case, the light curve allows you to set the period of rotation of the body at the time of observation. In variable stars, the change in brightness may be due to the movement around it of a less bright companion star, and may also indicate the presence of planets around it. Changes in the shifts or bifurcations of spectral lines of spectroscopic binaries make it possible to determine the radial velocity, which is the projection of the orbital velocity onto the line of sight. The radial velocity curves of one or both of the components make it possible to calculate the elements of the true orbit
Keywords:
astronomy; binary stars; astrophysics; spectral analysis
