AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46

Abstract

We present new radial velocity measurements of 586 stars in a one-degree field centered on the open cluster M46, and the planetary nebula NGC 2438 located within a nuclear radius of the cluster. The data are based on medium-resolution optical and near-infrared spectra taken with the AAOmega spectrograph on the Anglo-Australian Telescope. We find a velocity difference of about 30 km/s between the cluster and the nebula, thus removing all ambiguities about the cluster membership of the planetary nebula caused by contradicting results in the literature. The line-of-sight velocity dispersion of the cluster is 3.9+/-0.3 km/s, likely to be affected by a significant population of binary stars.

arXiv comment6 pages + 5 figures, accepted for publication in MNRAS

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• The ionization structure of multiple shell planetary nebulae: I. NGC 2438
• Investigating potential planetary nebula/cluster pairs
• Hubble Space Telescope Spectroscopy of a Planetary Nebula in an M31 Open Cluster: Hot-Bottom Burning at $3.4M_{\odot }$
• New Results for the Open Cluster Bica 6 and its Associated Planetary Nebula Abell 8
• The Open Cluster NGC 2437 (Messier 46)
• On the Crucial Cluster Andrews-Lindsay 1 and a 4% Distance Solution for its PN
• Solving the distance discrepancy for the open cluster NGC 2453. The planetary nebula NGC 2452 is not a cluster member
• On the Nature of the Protoplanetary Nebula OH\,231.8+4.2