SCYON Abstract

Received on October 17 2005

The Young Open Cluster NGC 2129

AuthorsGiovanni Carraro (1)
Brian Chaboyer (2)
James Perencevich (2)
(1) UChile/Yale
(2) Dartmouth
Accepted byMonthly Notices of the Royal Astronomical Society
Links NGC 2129


The first CCD UBV(RI)c photometric study in the area of the doubtful open cluster NGC 2129 is presented. Photometry of a field offset 15 arcmin northward is also provided, to probe the Galactic disk population toward the cluster. Using star counts, proper motions from the UCAC 2 catalog, 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 toward 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)o = 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 million years. These stars are used to provide new estimates of the cluster absolute proper motion components.