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Mass Segregation in the Open Cluster NGC 2422

Published online by Cambridge University Press:  22 December 2003

C. Boily ,
P. Patsis ,
S. Portegies ,
R. Spurzem ,
C. Theis ,
L. Prisinzano ,
G. Micela ,
S. Sciortino  and
F. Favata
L. Prisinzano
Affiliation:
Dipartimento di Scienze Fisiche ed Astronomiche, Università  di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
G. Micela
Affiliation:
INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
S. Sciortino
Affiliation:
INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
F. Favata
Affiliation:
Astrophysics Division - Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
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Abstract

UBVRI photometry of the open cluster NGC2422 (age~108 yr) down to alimiting magnitude V ≃ 19 is used to study the clusterspatial distribution and the luminosity and mass functions. From the Color-MagnitudeDiagram (CMD), we obtaineda 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 themass functions in theM=0.4-3.5 M⊙ range.By analyzing thespatial 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 MassFunction of NGC2422 can berepresented 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 thecluster are very similar to those of the Pleiades.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 10: JENAM 2002, Galactic & Stellar Dynamics , 2003 , pp. 163
Copyright
© EAS, EDP Sciences, 2003

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