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Recovering the ages and metallicities of stars of a complex stellar population system

Published online by Cambridge University Press:  01 October 2008

Sebastian L. Hidalgo ,
Antonio Aparicio  and
Carme Gallart
Sebastian L. Hidalgo
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, La Laguna, Tenerife, Canary Islands, Spain
Antonio Aparicio
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, La Laguna, Tenerife, Canary Islands, Spain Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Canary Island, Spain
Carme Gallart
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, La Laguna, Tenerife, Canary Islands, Spain
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Abstract

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We present a new method to solve for the star-formation history (SFH) of a complex stellar population system from the analysis of the color-magnitude diagram (CMD). The SFH is obtained in four steps: i) computing a synthetic CMD, ii) simulating observational effects, iii) parameterization and sampling of the synthetic and observed CMDs, and iv) solving and averaging the solutions. The consistency and stability of the method have been tested using a mock stellar population.

The method has been used to solve the SFH of a set of six isolated Local Group dwarf galaxies observed with HST. The main goal is to probe the effects of cosmological processes, such as reionization in the early star formation, or the ability of SNe feedback to remove gas in small halos, in dwarf galaxies free from environmental effects due to the strong interaction with the host galaxy.

Keywords

Hertzsprung-Russell diagramgalaxies: stellar content(galaxies:) Local Groupmethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S258: The Ages of Stars , October 2008 , pp. 245 - 252
Copyright
Copyright © International Astronomical Union 2009

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