Stochasticity effects on derivation of physical parameters of unresolved star clusters
de Meulenaer, Philippe
Astrophysics - Astrophysics of Galaxies
arxiv: Astrophysics::Galaxy Astrophysics | Astrophysics::Cosmology and Extragalactic Astrophysics | Quantitative Biology::Populations and Evolution | Astrophysics::Solar and Stellar Astrophysics
We developed a method for a fast modeling of broad-band UBVRI integrated magnitudes of unresolved star clusters and used it to derive their physical parameters (age, mass, and extinction). The method was applied on M33 galaxy cluster sample and consistency of ages and masses derived from unresolved observations with the values derived from resolved stellar photometry was demonstrated. We found that interstellar extinction causes minor age-extinction degeneracy for the studied sample due to a narrow extinction range in M33.