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

Source: [The population in the background of open clusters: Tracer of the Norma-Cygnus arm](<https://www.sota2.com/research/paper/68fa27402c2a3760193c16cc>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T03:07:26.616Z

Authors: A. K. Pandey, S. Sharma, K. Ogura

Published: 2006-08-31T16:30:39.000Z

## 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 $l\\sim120^\\circ$ to $l\\sim235^\\circ$. The background populations follow the downward warp of the Galactic plane around $l\\sim240^\\circ$.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/astro-ph/0608705>)

[PDF](<https://arxiv.org/pdf/astro-ph/0608705.pdf>)