Variable Stars in the Globular Cluster NGC 4590 (M68

TL;DR

This study conducted time series photometry of the metal-poor globular cluster NGC 4590 (M68), revising periods for known variables, detecting a change in Blazhko effect, and discovering new variable candidates, some confirmed as cluster members.

Contribution

The paper provides updated periods for known variables, reports a change in Blazhko effect, and identifies new variable candidates in NGC 4590, enhancing understanding of its variable star population.

Findings

Revised periods for 40 known variables with no significant changes.

Detected a considerable change in Blazhko effect for V25.

Discovered 9 new variable candidates, including RRc types.

Abstract

We present results of time series photometry to search for variable stars in the field of metal-poor globular cluster NGC 4590 (M68). Periods have been revised for 40 known variables and no significant changes were found. A considerable change in Blazhko effect for V25 has been detected. Among nine newly discovered variable candidates, 5 stars are of RRc Bailey type variables while 4 stars are unclassified. The variable stars V10, V21, V50 and V51 are found to be cluster members based on the radial velocity data taken from literature.