Variable Stars in the Field of the Open Cluster NGC 7789

TL;DR

This study reports the discovery and analysis of 15 variable stars in NGC 7789, including binaries and a delta Scuti star, providing insights into stellar variability within the cluster.

Contribution

First detailed survey of variable stars in NGC 7789, identifying key types and potential for mass determination of binary components.

Findings

15 variable stars discovered

7 are W UMa-type binaries, 5 are cluster members

Includes a delta Scuti Blue Straggler

Abstract

Fifteen variable stars have been discovered during four nights of monitoring of NGC 7789. It was possible to determine periods for ten of these variables. Seven objects are W UMa-type binaries, in this number five are members of the cluster. Among the remaining variables, there are three further close binaries, one delta Scuti which is a Blue Straggler in the cluster, and one multi-modal variable (with indeterminable periods). One of the binaries showed an eclipse-like event; this binary is a good candidate for determination of masses of its components at the turn-off point of the cluster.