A study of variable stars in the open cluster NGC 1582 and its surrounding field

TL;DR

This study used CCD time-series photometry to identify and classify variable stars in and around NGC 1582, discovering new variables and analyzing their properties and cluster membership.

Contribution

It presents new variable star discoveries in NGC 1582 and provides detailed classifications, physical properties, and membership analysis using multi-band photometry and archival data.

Findings

19 variable stars and 3 candidates detected

12 new variable stars discovered

RR Lyrae star estimated at 7.9 kpc distance

Abstract

This paper presents the Charge-Coupled Device time-series photometric observations of the open cluster NGC 1582 and its surrounding field with Johnson B, V and R filters by using Nanshan 1m telescope of Xinjiang Astronomical Observatory. 19 variable stars and 3 variable candidates were detected in a 45 {\times} 48.75 field around the cluster. 12 of the variable stars are newly-discovered variable objects. The physical properties, classifications, and membership of the 22 objects are studied through their light curves, their positions on the color-magnitude diagram, and with the archival data from the Naval Observatory Merged Astrometric Dataset. Among these objects, 5 are eclipsing binary systems, 6 are pulsating variable stars including one known Delta Scuti star and one newly-discovered RR Lyrae star. The distance of the RR Lyrae star is estimated to be 7.9 {\pm} 0.3 kpc, indicates that the star locates far behind the cluster. 4 variable stars are probable members of the cluster, and 13 of the 22 objects are confirmed to be field stars.