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Membership of Globular Cluster NGC 6121

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
H. Chen ,
C.-H. Peng  and
C.-M. Ko
H. Chen
Affiliation:
Institute of Astronomy, National Central University, Jhongli 320, Taiwan. e-mail: huichen@astro.ncu.edu.tw & m989008@astro.ncu.edu.tw
C.-H. Peng
Affiliation:
Institute of Astronomy, National Central University, Jhongli 320, Taiwan. e-mail: huichen@astro.ncu.edu.tw & m989008@astro.ncu.edu.tw
C.-M. Ko
Affiliation:
Institute of Astronomy, National Central University, Jhongli 320, Taiwan. e-mail: huichen@astro.ncu.edu.tw & m989008@astro.ncu.edu.tw Physics Department Centre for Complex System, National Central University, Jhongli 320, Taiwan; e-mail: cmko@astro.ncu.edu.tw
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Abstract

We have developed a method for obtaining membership of globular cluster NGC 6121 by radius-velocity profiles of a self- gravitating system. Previous works usually identified the membership of clusters by spatial distribution (radius), velocity distribution (proper motion), and photometry (isochrone in colour-magnitude diagram). However, field star contamination might be severe by method of spatial distribution and photometric method, and many high speed stars near the central region might be missed by velocity distribution method. More complete members could be identified by this method.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 385 - 388
Copyright
© EAS, EDP Sciences 2011

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References

Références

Chen, H.-C., & Ko, C.-M., 2009, ApJ, 698, 1659 CrossRef
Harris, W.E., 1996, AJ, 112, 1487 CrossRef