Review of the classification and properties of 62 variable stars in Cygnus

TL;DR

This paper reviews and refines the classification and properties of 62 variable stars in Cygnus, confirming variability, updating classifications, and correcting database errors using data analysis and period studies.

Contribution

It provides new period and type determinations for 17 variables, corrects database cross-references for 23 stars, and proposes classifications for 3 previously unknown types.

Findings

Confirmed variability for all stars.

Discovered new period/type for 17 stars.

Corrected database cross-references for 23 stars.

Abstract

This study aims to assess the properties and classification of 62 variable stars in Cygnus, little studied since their discovery and originally reported in the Information Bulletin on Variable Stars (IBVS) 1302. Using data from previous studies and several astronomical databases, we performed our analysis mainly utilizing a period analysis software and comparing the photometric characteristics of the variables in a Colour-Absolute Magnitude Diagram. For all stars, the variability is confirmed. We discovered new significant results for the period and/or type of 17 variables and highlighted incorrect cross-reference names on astronomical databases for 23 stars. For 3 stars, whose original type was unknown, we propose a new type. We calculated an epoch of a minimum or a maximum for 24 stars; for 3 of them, the epoch has been defined for the first time. This assessment also identifies some cases for which results from the ASAS-SN Catalog of Variable Stars are not consistent with results from Gaia DR2 and/or our analysis.