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Issue A&A
Volume 423, Number 1, August III 2004
Page(s) 133 - 146
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20048007



A&A 423, 133-146 (2004)
DOI: 10.1051/0004-6361:20048007

Stellar populations in HII galaxies

P. Westera1, F. Cuisinier1, E. Telles2 and C. Kehrig2

1  GEMAC, Observatório do Valongo/UFRJ, Ladeira do Pedro Antônio, 43, 20.080-090 Rio de Janeiro, Brazil
    e-mail: [westera;francois]@ov.ufrj.br
2  Observatório Nacional, Rua José Cristino, 77, 20.921-400 Rio de Janeiro, Brazil
    e-mail: [etelles;kehrig]@on.br

(Received 4 April 2003 / Accepted 5 May 2004 )

Abstract
We analyse the stellar content of a large number of HII galaxies from the continua and absorption features of their spectra using population synthesis methods, in order to gain information about the star formation histories of these objects.

We find that all galaxies of our sample contain an old stellar population ( $\geq$ 1 Gyr) that dominates the stellar mass, and in a majority of these we also found evidence for an intermediate-age population $\geq$ 50 Myr apart from the presently bursting, ionizing young generation $\leq$ 107 yr.


Key words: catalogs -- stars: atmospheres -- HII regions -- galaxies: evolution -- galaxies: starburst -- galaxies: stellar content

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© ESO 2004

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