2 papers
astro-ph1997
Indicators of star formation: 4000 Angstrom break and Balmer lines
B. M. Poggianti, G. Barbaro
The behaviour of the 4000 Angstrom break index and of the equivalent width of the main Balmer lines is investigated a) for a single star as a function of effective temperature, gra…
astro-ph1996
Starbursts and the Butcher-Oemler effect in galaxy clusters
B. M. Poggianti, G. Barbaro
In order to explain the spectroscopic observations of most of the galaxies in intermediate redshift clusters, bursts of star formation superimposed to the traditional scenario of g…