Investigation of Non-Stable Processes in Close Binary Ry Scuti

TL;DR

This study reanalyzed historical photometric data of the close binary RY Scuti, revealing non-stable processes and periodic light variations that may relate to LBV star behaviors and nebula ejection.

Contribution

It provides new insights into the variability of RY Scuti through reanalysis of decades-old data, highlighting non-stable processes and periodic changes.

Findings

Detected non-stable processes in RY Sct across different timescales.

Identified periodic light variations near the first maximum over several years.

Suggested possible links between variability and nebula ejection in RY Sct.

Abstract

We present results of reanalysis of old electrophotometric data of early type close binary system RY Scuti obtained at the Abastumani Astrophysical Observatory, Georgia, during 1972-1990 years and at the Maidanak Observatory, Uzbekistan, during 1979-1991 years. It is revealed non-stable processes in RY Sct from period to period, from month to month and from year to year. This variation consists from the hundredths up to the tenths of a magnitude. Furthermore, periodical changes in the system's light are displayed near the first maximum on timescales of a few years. That is of great interest with regard to some similar variations seen in luminous blue variable (LBV) stars. This also could be closely related to the question of why RY Sct ejected its nebula.