An efficient approach to extract parameters from star cluster CMDs: fitCMD

Abstract

This work presents an approach (fitCMD) designed to obtain a comprehensive set of astrophysical parameters from colour-magnitude diagrams (CMDs) of star clusters. Based on initial mass function (IMF) properties taken from isochrones, fitCMD searches for the values of total (or cluster) stellar mass, age, global metallicity, foreground reddening, distance modulus, and magnitude-dependent photometric completeness that produce the artificial CMD that best reproduces the observed one; photometric scatter is also taken into account in the artificial CMDs. Inclusion of photometric completeness proves to be an important feature of fitCMD, something that becomes apparent especially when luminosity functions are considered. These parameters are used to build a synthetic CMD that also includes photometric scatter. Residual minimization between the observed and synthetic CMDs leads to the best-fit parameters. When tested against artificial star clusters, fitCMD shows to be efficient both in terms of computational time and ability to recover the input values.

Accepted for publication in MNRAS

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• Astrophysical Parameters and Dynamical Evolution of Open Clusters: NGC 2587, Col 268, Mel 72, Pismis 7
• Lifting the dust veil from the Globular Cluster Palomar2
• Variable stars detection in the field of open cluster NGC 188
• S-PLUS: Exploring wide field properties of multiple populations in galactic globular clusters at different metallicities