The young open cluster NGC 2129 |
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| Authors: | Giovanni Carraro Brian Chaboyer James Perencevich |
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| Institution: | Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile;Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA;Dipartimento di Astronomia, Universitàdi Padova, Vicolo Osservatorio 2, I-35122 Padova, Italy;Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, NH 03755-3528, USA |
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| Abstract: | The first charge-coupled device UBV ( RI )C photometric study in the area of the doubtful open cluster NGC 2129 is presented. Photometry of a field offset 15 arcmin northwards is also provided, to probe the Galactic disc population towards the cluster. Using star counts, proper motions from the UCAC2 catalogue, colour–magnitude and colour–colour diagrams, we demonstrate that NGC 2129 is a young open cluster. The cluster radius is 2.5 arcmin, and across this region we find evidence of significant differential reddening, although the reddening law seems to be normal towards its direction. Updated estimates of the cluster fundamental parameters are provided. The mean reddening is found to be E ( B ? V ) = 0.80 ± 0.08 and the distance modulus is ( m ? M )0= 11.70 ± 0.30 . Hence, NGC 2129 is located at 2.2 ± 0.2 kpc from the Sun inside the Local spiral arm. The age derived from 37 photometrically selected members is estimated to be approximately 10 Myr. These stars are used to provide new estimates of the cluster absolute proper-motion components. |
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| Keywords: | Hertzsprung–Russell (HR) diagram open clusters and associations: general open clusters and associations: individual: NGC 2129 |
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