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The outside-in formation of elliptical galaxies
Antonio Pipino, Francesca Matteucci, Cristina Chiappini
In this paper we compare the predictions of a detailed multi-zone chemical evolution model for elliptical galaxies with the very recent observations of the galaxy NGC 4697. As a co…
Do observed metallicity gradients of early-type galaxies support a hybrid formation scenario?
Ricardo L. C. Ogando, Marcio A. G. Maia, Cristina Chiappini +3
We measure radial gradients of the Mg2 index in 15 E-E/S0 and 14 S0 galaxies. Our homogeneous data set covers a large range of internal stellar velocity dispersions (2.0<logsigma<2…
The effects of Population III stars and variable IMF on the chemical evolution of the Galaxy
Silvia Kuna Ballero, Francesca Matteucci, Cristina Chiappini
We studied the effects of a hypothetical initial stellar generation (PopIII) of only massive and very massive stars (VMS) on the chemical evolution of the Galaxy. We adopted the tw…
The origin of nitrogen: Implications of recent measurements of N/O in Galactic metal-poor stars
C. Chiappini, F. Matteucci, S. K. Ballero
Recent new high-precision abundance data for Galactic halo stars suggest important primary nitrogen production in very metal-poor massive stars. Here, we compute a new model for th…