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The Star Formation History of Phoenix Dwarf Galaxy using IAC-pop Algorithm

Published online by Cambridge University Press:  01 December 2006

Sebastian L. Hidalgo ,
Antonio Aparicio  and
David Martínez-Delgado
Sebastian L. Hidalgo
Affiliation:
University of Minnesota, Minneapolis, MN, USA email: [email protected]
Antonio Aparicio
Affiliation:
Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Canary Island, Spain Instituto de Astrofísica de Canarias, Vía Láctea, La Laguna, Tenerife, Canary Islands, Spain
David Martínez-Delgado
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, La Laguna, Tenerife, Canary Islands, Spain
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Abstract

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The Star Formation History (SFH) of the Phoenix dwarf galaxy has been obtained using IAC-star and IAC-pop. The observations are based on WFPC2@HST. The results show a Star Formation Rate (SFR) decreasing with time and that star formation has happened in Phoenix up to 0.5 Gyr ago. The metallicity decrease with the stellar age: z>0.0007 for stars younger than 5 Gyr and z<0.0004 for stars older than 10 Gyr. Using the SFH as a function of galactocentric radius, the length scale αN of the star density distribution profile has been obtained as a function of the time. The results show that αN decreases smoothly with time, suggesting a sort of shrinking scenario for the evolution of Phoenix.

Keywords

galaxies: dwarfgalaxies: stellar contentgalaxies: evolutiongalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 345 - 346
Copyright
Copyright © International Astronomical Union 2007

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