MASSCLEANcolors - Mass Dependent Integrated Colors for Stellar Clusters Derived from 30 Million Monte Carlo Simulations - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: We present Monte Carlo models of open stellar clusters with the purpose ofmapping out the behavior of integrated colors with mass and age. Our clustersimulation package allows for stochastic variations in the stellar massfunction to evaluate variations in integrated cluster properties. We find thatUBVK colors from our simulations are consistent with simple stellar populationSSP models, provided the cluster mass is large, Mcluster >= 10^6 M Sun. Belowthis mass, our simulations show two significant effects. First, the mean valueof the distribution of integrated colors moves away from the SSP predictionsand is less red, in the first 10^7 to 10^8 years in UBV colors, and for allages in V - K. Second, the 1\sigma dispersion of observed colors increasessignificantly with lower cluster mass. The former we attribute to the reducednumber of red luminous stars in most of the lower mass clusters and the laterwe attribute to the increased stochastic effect of a few of these stars onlower mass clusters. This later point was always assumed to occur, but we nowprovide the first public code able to quantify this effect. We are completing amore extensive database of magnitudes and colors as a function of stellarcluster age and mass that will allow the determination of the correlationcoefficients among different bands, and improve estimates of cluster age andmass from integrated photometry.



Autor: Bogdan Popescu, M.M. Hanson

Fuente: https://arxiv.org/







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