http://sjunijournals.ge/index.php/AA <p>The journal “<strong>Astronomy &amp; Astrophysics (Caucasus)</strong>” is an international, scientific peer-reviewed electronic publication. The purpose of the journal is to provide the scientific society with the information about the latest researches in astronomy and astrophysics. The technical parameters of the articles submitted to the “<strong>Astronomy &amp; Astrophysics (Caucasus)</strong>” are similar to those of the articles published in the US leading international scientific journals. Only the original astronomical and astrophysical articles after with a positive review will be published in the journal.</p> <p>The journal also publishes papers of international scientific conferences (forums, symposiums, etc.), reports of scientific expeditions and reviews.</p> en-US Astronomy & Astrophysics (CAUCASUS) 2449-2493 http://sjunijournals.ge/index.php/AA/article/view/218 <p>We presented photometric observations for the one UV Ceti type and three W Ursae Majoris- type variable stars. The flare of the UV Ceti type star lasted about two hours, and the star changed magnitude to 3.9 within about two minutes. The values of color indices <em>V-R</em>, the rotational periods and the composite lightcurves have been obtained for the EW stars. Using a relation of an absolute magnitude- period obtained by Mateo and Rucinski (2017) and interstellar extinction from the three-dimensional map of Milky Way dust (<a href="http://argonaut.skymaps.info">http://argonaut.skymaps.info</a>) and Green et al. (2019), we have calculated the absolute magnitudes of the EW stars and distances to them. The parallaxes obtained from our data differ from those given in Gaia DR 3, which may be due to insufficient quality calibration of the absolute magnitude-period relation and with the estimations of interstellar extinction.</p> Vasilij G. Shevchenko Daniil O. Danylko Ivan G. Slyusarev Revaz A. Chigladze Copyright (c) 2025 Astronomy & Astrophysics (CAUCASUS) 2025-01-12 2025-01-12 9 1 7