The population in the background of open clusters: tracer of the Norma-Cygnus arm |
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| Authors: | A K Pandey S Sharma K Ogura |
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| Institution: | Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands;Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;SRON National Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands;Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;Astronomical Institute, Utrecht University, PO Box 90000, 3508 TA Utrecht, the Netherlands |
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| Abstract: | We present colour–magnitude diagrams of open clusters, located in the range 112° < l < 252° , 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 the Norma-Cygnus (outer) arm. The outer arm seems to be continued from l ～ 120° to ～235°. The background populations follow the downward warp of the Galactic plane around l ～ 240° . |
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| Keywords: | binaries: close white dwarfs X-rays: binaries |
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