EAS Publications Series
Volume 10, 2003JENAM 2002, Galactic & Stellar Dynamics
|Page(s)||163 - 163|
|Published online||22 December 2003|
C. Boily, P. Patsis, S. Portegies Zwart, R. Spurzem and C. Theis (eds)
EAS Publications Series, 10 (2003) 163
Mass Segregation in the Open Cluster NGC 2422
Dipartimento di Scienze Fisiche ed Astronomiche,
Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
2 INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
3 Astrophysics Division - Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
UBVRI photometry of the open cluster NGC2422 (age ~108 yr) down to a limiting magnitude V ≃ 19 is used to study the cluster spatial distribution and the luminosity and mass functions. From the Color-Magnitude Diagram (CMD), we obtained a list of candidate cluster members based on a photometric criterion. Using a comparison field region and an iterative procedure, a correction for contaminating field stars has been inferred in order to obtain the luminosity and the mass functions in the M=0.4-3.5 M⊙ range. By analyzing the spatial distribution, we infer that a non-negligible number of cluster stars lie outside our investigated region. We estimate a correction to the mass function of the cluster in order to take into account the complete stellar population. The Present Day Mass Function of NGC2422 can be represented by a power-law of index α = 3.07 ± 0.08 (rms) in the mass range 0.9 ≤ M/M⊙ ≤ 2.5. The index α and the total mass of the cluster are very similar to those of the Pleiades.
© EAS, EDP Sciences, 2003
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