An Accretion-Disc Model for the Algol-Type Eclipsing Binary System AV Del

TL;DR

This paper models the AV Del eclipsing binary system, revealing it as a semi-detached system with an optically thick accretion disc around the primary star, using light and radial-velocity data analyzed with the Wilson-Devinney and SHELLSPEC codes.

Contribution

It introduces an accretion disc model for AV Del based on detailed light and radial-velocity curve analysis, providing new insights into its structure and physical parameters.

Findings

AV Del is a semi-detached system with an accretion disc.

The disc has an outer radius of 8.0 R_sun and temperature of 5700 K.

The system's parameters were determined using Wilson-Devinney and SHELLSPEC codes.

Abstract

This study inspects the light and radial-velocity curves of the eclipsing binary AV Del. In comparison with other studies already done, the study shows that the absolute elements, fundamental orbital and physical parameters of the system can be determined using the Wilson-Devinney code. Using these parameters, the configuration of the system is presented. Then, an accretion disc model for the system is introduced by using the SHELLSPEC code. The results indicate that AV Del is a semi-detached system in which an optically thick accretion disc is surrounding the primary star. The outer radius of the disc is 8.0 R_sun}, corresponding to a distance of 1.1 R_sun} from the surface of the secondary. Also, the temperature of the disc is calculated to be T=5700 K.