Discovery of an open cluster with a possible physical association with a planetary nebula

Abstract

We report the discovery of a new open cluster (OC) in the Galaxy at $\ell =167.0^{\circ }$ and $b=-1.0^{\circ }$. Its field includes the planetary nebula (PN) PK 167-0.1. We study the possible associations of the PN/OC pairs NGC 2818/NGC 2818A, NGC 2438/M 46 (NGC 2437), PK 6+2.5/NGC 6469, as well as of the PN PK 167-0.1 with New Cluster 1. The analyses are based on near-infrared colour-magnitude diagrams (CMDs) and stellar radial density profiles (RDPs). NGC 6469 is located in a heavily contaminated bulge field. The CMD morphology, especially for the latter two cases, is defined with a field star decontamination algorithm applied to the 2MASS \jj, \hh, and \ks photometry. Field decontamination for the OCs NGC 2818A and M 46 produced better defined CMDs and more accurate cluster parameters than in the literature. Those pieces of evidence point to M 46 as physically associated with the PN NGC 2438. The same occurs for the OC NGC 2818A and the PN NGC 2818, however previous radial velocity arguments indicate that they are not associated. The OC NGC 6469 does not appear to be associated with the PN PK 6+2.5, which probably belongs to the bulge. Finally, the distance of the OC New Cluster 1 is consistent with a physical association with the PN PK 167-0.1.

The paper contains 9 figures and 5 tables. Accepted by MNRAS

References in corpus (6)

• Open clusters in dense fields: the importance of field-star decontamination for NGC5715, Lynga4, Lynga9, Trumpler23, Trumpler26 and Czernik37
• Do most planetary nebulae derive from binaries? I Population synthesis model of the galactic planetary nebula population produced by singlestars and binaries
• Wide Field CCD photometry around nine open clusters
• Faint open clusters with 2MASS: BH 63, Lyngå2, Lyngå12 and King 20
• Methods for improving open cluster fundamental parameters applied to M 52 and NGC 3960
• In Search of Possible Associations between Planetary Nebulae and Open Clusters

Cited by in corpus (3)

• Investigating the borderline between a young star cluster and a small stellar association: a test case with Bochum1
• Investigating the age and structure of the infrared old open clusters LK1, LK10, FSR1521 and FSR1555
• AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46