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Abstract: We have tested the application to Sloan Digital Sky Survey data of thesoftware package MATCH, which fits color-magnitude diagrams CMDs to estimatestellar population parameters and distances. These tests on a set of sixglobular clusters show that these techniques recover their known properties.New ways of using the CMD-fitting software enable us to deal with an extendeddistribution of stars along the line-of-sight, to constrain the overallproperties of sparsely populated objects, and to detect the presence of stellaroverdensities in wide-area surveys. We then also apply MATCH to CMDs for twelverecently discovered Milky Way satellites to derive in a uniform fashion theirdistances, ages and metallicities. While the majority of them appear consistentwith a single stellar population, CVn I, UMa II, and Leo T exhibit from SDSSdata alone a more complex history with multiple epochs of star formation.



Autor: J. T. A. de Jong 1, H-W. Rix 1, N. F. Martin 1, D. B. Zucker 2, A. E. Dolphin 3, E. F. Bell 1, V. Belokurov 2, N. W. Evans 2; 1 M

Fuente: https://arxiv.org/







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