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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

References

Aparicio, A., & Gallart, C. 2004, AJ, 128, 1465CrossRefGoogle Scholar
Aparicio, A. & Hidalgo, S. L. 2007 AJ, submittedGoogle Scholar
Bertelli, G., Bressan, A., Chiosi, C., Fagotto, F., & Nasi, E. 1994, AAPS, 106, 275Google Scholar
Gallart, C., Aparicio, A., Freedman, W. L., Madore, B. F., Martínez-Delgado, D., & Stetson, P. B. 2004, AJ, 127, 1486CrossRefGoogle Scholar
Held, E. V., Saviane, I., & Momany, Y. 1999, AAP, 345, 747Google Scholar
Hidalgo, S. L., Marín-Franch, A., & Aparicio, A. 2003, AJ, 125, 1247CrossRefGoogle Scholar
Hidalgo, S. L., Aparicio, A., & Martínez-Delgado, D. 2007 ApJ, submittedGoogle Scholar
Holtzman, J. A., Smith, G. H., & Grillmair, C. 2000, AJ, 120, 3060CrossRefGoogle Scholar
Martínez-Delgado, D., Gallart, C., & Aparicio, A. 1999, AJ, 118, 862CrossRefGoogle Scholar
Ortolani, S., & Gratton, R. G. 1988, PASP, 100, 1405CrossRefGoogle Scholar
Stetson, P. B. 1994, PASP, 106, 250CrossRefGoogle Scholar