WBVR Observations of the Variable Star V1341 Cyg in 1986-1992

TL;DR

This study presents WBVR photometry of the X-ray binary V1341 Cyg over several years, revealing light variation amplitudes, the influence of gravitational distortion, and potential accretion disk instabilities affecting its active states.

Contribution

First detailed WBVR photometric analysis of V1341 Cyg spanning 1986-1992, highlighting light variation characteristics and possible accretion disk instability effects.

Findings

Ellipsoidal light variation amplitudes in B and W bands.

Active states may be caused by accretion disk instability.

Presence of a low-luminosity accretion disk.

Abstract

We report the results of WBVR photometry of the massive close x-ray binary V1341 Cyg=Cyg X-2 in 1986-1992. In the "off" state the amplitudes of the periodic component of light variations lie in the $0^{m}.265 - 0^{m}.278$ and $0^{m}.290 - 0^{m}.320$ intervals for the B- and W-bands, respectively, and is determined by the ellipsoidal shape of the optical component, which is distorted by the gravitational influence of its x-ray companion. Some of the active states of the system (long outbursts) may be due to the instability of the accretion disk (AD) and, possibly, to the nonstationarity of the gaseous flows and other accretion formations. The close binary system (CBS) contains a low-luminosity AD.