Analysis of H-alpha spectra of Beta Lyrae observed at Bosscha observatory.

β Lyræ eclipsing binary system has been studied extensively. Observations have revealed its unique environment. Hα emission is one of the most dominant feature being studied. In this work, we analyzed Hα spectra obtained at Bosscha Observatory from 2018 all the way through 2022. From the extracted spectra we measure the equivalent width (EW), full width at half maximum (FWHM), and the center of both emission peaks. The extracted information then be used to derive violet-to-red peak intensity ratio (V/R), emission-to-continuum ratio (E/C), different velocity between each peak (ΔV) as well as the Hα disk radius. We found that there exist the overall V/R and E/C change throughout the observation period with an increasing V/R trend and decreasing E/C trend. The Hα disk radius is found to be changing in a way that the mass transfer in β Lyræ system is heading towards the end. [ABSTRACT FROM AUTHOR]