Optical and X-ray Outbursts of Be/X-ray binary system SAX J2103.5+4545

TL;DR

This study investigates the correlation between optical and X-ray outbursts in the Be/X-ray binary SAX J2103.5+4545, revealing how Halpha line profiles and optical brightness relate to X-ray activity.

Contribution

It provides a detailed analysis of optical and X-ray observations, highlighting the evolution of Halpha profiles and their connection to X-ray outbursts in the system.

Findings

X-ray outburst follows optical outburst in the system.

Halpha profiles change from emission to absorption during the outburst cycle.

Double-peaked HeI lines suggest transient accretion disc formation.

Abstract

We present the relations between Halpha equivalent width, optical brightness and X-ray flux of Be/X-ray binary system SAX J2103.5+4545, by analyzing the optical photometric and spectroscopic observations together with the X-ray observations. In the photometric observations PSF photometry were applied using MIDAS and its DAOPHOT package. The reduction and analysis of spectra were done by using MIDAS and its suitable packages. The X-ray outburst of the system occurred just after the optical outburst. The nearly symmetric Halpha emission line profiles observed during the beginning of optical outburst turn into asymmetric profiles with increased EW values during the dissipation of Be disc. Halpha lines changed from emission to absorption during the observation period. The observed double peaked HeI emission lines might come from the accretion disc of neutron star which is temporarily formed at the time of X-ray outburst.