New IC 348 members in the outer part of the cluster

Physics

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Scientific paper

The IC 348 star cluster contains about 300 known members. It has been observed at several wavelengths with deep optical and near-infrared ground observations, and from space with XMM-Newton, Chandra and HST observations. The cluster is embedded in the Perseus molecular cloud, making any clustering analysis subject to extinction bias. We propose to revisit IC 348 based a on statistical approach using 2MASS data. We performed a combined analysis of the star density and color in this region in order to establish a surface density map of the cluster. We reach the conclusion that IC 348 is actually significantly larger than previously thought by nearly a factor of 2 and we estimate that more than 50 members brighter than K=14 mag are still unknown. These new members are located in the outer regions of the cluster, where very few dedicated observations have been realized so far, which is probably why they escaped to previous identification. This result will give new insights to study the star formation history and the dynamical evolution of IC 348.

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