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Activity Number: 367
Type: Topic Contributed
Date/Time: Wednesday, August 1, 2007 : 8:30 AM to 10:20 AM
Sponsor: Section on Bayesian Statistical Science
Abstract - #310018
Title: A Statistical Approach to Stellar Archaeology
Author(s): Hyunsook Lee*+ and Vinay L. Kashyap and Andreas Zezas
Companies: Harvard-Smithsonian Center for Astrophysics and Harvard-Smithsonian Center for Astrophysics and Harvard-Smithsonian Center for Astrophysics
Address: 60 Garden St MS 70, Cambridge, MA, 02138,
Keywords: Isochrones ; Color-Maginitude Diagram (CMD) ; Error Magnitude ; Likelihood ; Information ; Posterior Distribution
Abstract:

In this presentation, we propose a statistical color magnitude diagram (CMD) fitting procedure, which for the first time provides stellar age uncertainty, based on photometric and theoretical model uncertainties. Fitting the theoretical isochrones to color-magnitude data has been recognized as a tool for identifying the age of stars and stellar associations, where the age information is imprinted on the {\it p}-dimensional distribution of their {\it p}-band photometric data. We begin with constructing the likelihood of a star cluster which provides the most probable age of the cluster. The density form of this likelihood, then, proffers the posterior distribution of each individual star that accounts for the age uncertainty due to the photometric measurement uncertainties and astrophysical model uncertainties. Our method is illustrated with stars of the Small Magellanic Cloud.


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