Membership of Globular Cluster NGC 6121

H. Chen; C.-H. Peng; C.-M. Ko

doi:10.1051/eas/1045065

All issues

Volume 45 (2010)

EAS Publications Series, 45 (2010) 385-388

Abstract

Issue		EAS Publications Series Volume 45, 2010 GAIA: At the Frontiers of Astrometry


Page(s)		385 - 388
DOI		https://doi.org/10.1051/eas/1045065
Published online		15 February 2011

GAIA: At the Frontiers of Astrometry
C. Turon, F. Meynadier and F. Arenou (eds)
EAS Publications Series, 45 (2010) 385-388

Membership of Globular Cluster NGC 6121

H. Chen¹, C.-H. Peng¹ and C.-M. Ko²^,1

¹ Institute of Astronomy, National Central University, Jhongli 320, Taiwan
e-mail: huichen@astro.ncu.edu.tw & m989008@astro.ncu.edu.tw
² Physics Department Centre for Complex System, National Central University, Jhongli 320, Taiwan
e-mail: cmko@astro.ncu.edu.tw

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.