The Membership and Distance of the Open Cluster Collinder 419

TL;DR

This paper determines the distance and membership of the young open cluster Collinder 419 using spectral classifications, photometry, and astrometric data, establishing its distance at approximately 741 parsecs and analyzing its stellar content.

Contribution

It provides new measurements of the cluster's distance, reddening, and stellar membership, utilizing updated spectral and photometric data for the first time.

Findings

Cluster distance: 741 ± 36 pc

Reddening: E(B-V)=0.37 ± 0.05 mag

Presence of very young stars including a reddened M3 III star

Abstract

The young open cluster Collinder 419 surrounds the massive O star, HD 193322, that is itself a remarkable multiple star system containing at least four components. Here we present a discussion of the cluster distance based upon new spectral classifications of the brighter members, UBV photometry, and an analysis of astrometric and photometric data from the UCAC3 and 2MASS catalogs. We determine an average cluster reddening of E(B-V)=0.37 +- 0.05 mag and a cluster distance of 741 +- 36 pc. The cluster probably contains some very young stars that may include a reddened M3 III star, IRAS~20161+4035.