A suite of classical Cepheids tied to the binary cluster Berkeley 58 \& NGC 7790

TL;DR

This paper identifies and confirms a set of classical Cepheids as members of the binary open cluster system NGC 7790 and Berkeley 58, using photometric, astrometric, and spectroscopic data to establish their association.

Contribution

It provides a detailed analysis confirming the membership of specific Cepheids in the binary cluster system using multi-faceted observational data.

Findings

Cepheids CE Cas A, CE Cas B, CF Cas, and CG Cas are members of the binary cluster.

The clusters are of similar age and proximity based on photometry and Gaia data.

NGC 7788 is a younger, less distant cluster, not associated with the Cepheids.

Abstract

The classical Cepheids CE Cas A, CE Cas B, CF Cas, and CG Cas are likely members of the binary open cluster comprising NGC 7790 and Berkeley 58. The clusters are of comparable age and in close proximity, as deduced from differentially dereddened $UuB_PBVGR_P$ photometry, and Cepheid period-age relations. Gaia DR3 astrometric and spectroscopic solutions for the clusters are likewise consistent. Conversely, the seemingly adjacent open cluster NGC 7788 is substantially younger and less distant.