Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-05-27
Astronomy and Astrophysics
Astrophysics
Contributed talk to the 34th Rencontres de Moriond, 13-20 March 1999, ``Building Galaxies: from the Primordial Universe to the
Scientific paper
We propose an evolutionary scenario by successive bursts of star formation to reproduce the chemical properties of massive nearby Starburst Nucleus Galaxies (SBNGs). The N/O abundance ratios in SBNGs are 0.2 dex higher than in normal HII regions observed in the disks of late-type spirals. The variation of the N/O ratio as a function of metallicity follows a "primary + secondary" relation, but the increase of nitrogen does not appear as a continuous process. Assuming that nitrogen is produced by intermediate-mass stars, we show that our observations are consistent with a model where the bulk of nitrogen in SBNGs was formed during past sequences of bursts of star formation which probably started 2 or 3 Gyrs in the past.
Carlos Reyes R. E.
Considere Suzanne
Contini Thierry
Coziol Roger
Davoust Emmanuael
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