Statistics – Computation
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248...45a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 45-54.
Statistics
Computation
6
Elliptical Galaxies, Globular Clusters, Metallicity, Stellar Evolution, Stellar Winds, Computational Astrophysics, Galactic Evolution, Spheroids, Stellar Mass, Stellar Structure, Stellar Systems
Scientific paper
The closed one-zone model was applied to the evolution of spheroidal star systems (from globular clusters to elliptical galaxies) in order to determine the occurrence of global winds driven by supernovae and the stellar metal enrichment. The initial conditions to be used in the computations were selected so that the final binding energies of the system models agreed with those given, on the average, by observations. An iterative procedure was devised in order to fulfill this requirement. The results show that, when the bulk of stars was formed, protogalaxies should have been more tightly bound than assumed in previous one-zone models. Moreover, the impulsive global wind setting the end of the star formation was rather unconspicuous, whereas the subsequent gradual mass loss might have been much more effective. Some observational constraints on the stellar metallicity, and the mass and metal content of the ejected gas are discussed. Major observational properties can be met very satisfactorily with a rapid star formation rate and an initial mass-power function with exponent between 0.95 and 1.35.
Angeletti Lucio
Giannone Pietro
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