The population in the background of open clusters: Tracer of the Norma-Cygnus arm

Abstract

We present colour-magnitude diagrams of open clusters, located in the range $112^{\circ }<l<252^{\circ }$, manifesting stellar populations in the background of clusters. Some of the populations are found to be located beyond the Perseus arm and may be the part of Norma-Cygnus (outer) arm. The outer arm seems to be continued from $l\sim 120^{\circ }$ to $l\sim 235^{\circ }$. The background populations follow the downward warp of the Galactic plane around $l\sim 240^{\circ }$.

Accepted for the publication in MNRAS, 9 pages, 9 figures, 2 tables

References in corpus (4)

• Outer structure of the Galactic warp and flare: explaining the Canis Major over-density
• Wide Field CCD photometry around nine open clusters
• Spiral structure of the Third Galactic Quadrant and the solution to the Canis Major debate
• BVI photometry of the very old open cluster Berkeley 17

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• Optical and Near-infrared survey of the stellar contents associated with the star-forming Complex Sh2-252
• Blue Straggler Stars in Galactic Open Clusters and the effect of field star contamination
• Photometry of a Galactic field at l = 232, b = -6. The old open cluster Auner 1, the Norma-Cygnus spiral arm and the signature of the warped Galactic Thick Disk
• Photometric study of distant open clusters in the second quadrant: NGC 7245, King 9, King 13 and IC 166
• Deep optical survey of the stellar content of Sh2-311 region