On the accretion disc properties in eclipsing dwarf nova EM Cyg

TL;DR

This study investigates the accretion disc properties of the eclipsing dwarf nova EM Cyg through observational data and eclipse mapping, revealing its outburst behavior and temperature distribution during different activity states.

Contribution

It applies eclipse mapping to EM Cyg to reconstruct the accretion disc's temperature profile and estimates accretion rates during quiescent and outburst phases.

Findings

EM Cyg exhibits outbursts every 15-40 days.

Eclipse mapping reveals temperature distribution in the accretion disc.

Accretion rates differ between quiescent and outburst states.

Abstract

In this paper we analyzed the behavior of the unusual dwarf nova EM Cyg using the data obtained in April-October, 2007 in Vyhorlat observatory (Slovak Republic) and in September, 2006 in Crimean Astrophysical Observatory (Ukraine). During our observations EM Cyg has shown outbursts in every 15-40 days. Because on the light curves of EM Cyg the partial eclipse of an accretion disc is observed we applied the eclipse mapping technique to reconstruct the temperature distribution in eclipsed parts of the disc. Calculations of the accretion rate in the system were made for the quiescent and the outburst states of activity for different distances.