Statistics – Computation
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..539m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 539-543.
Statistics
Computation
135
Abundance, Galactic Bulge, Metallicity, Milky Way Galaxy, Nuclear Fusion, Stellar Evolution, Supernovae, Astronomical Models, Chemical Evolution, Computational Astrophysics, Stellar Composition
Scientific paper
Using chemical evolution models, it is shown that the metallicity distribution of bulge K giants can be very well reproduced under the relatively simple assumptions. These are: fast evolution characterized by a fast collapse, a very efficient star-formation rate relative to the solar vicinity region, and an initial mass function (IMF) with a slightly lower power index than the Salpeter one. Numerical experiments are reported which show that the range of variation for the star-formation efficiency and the time scale of formation of the system needed to reproduce the main characteristics of bulge stars is quite narrow. The major uncertainty resides in the IMF. A prediction is made of the abundance ratios of alpha elements with respect to iron which should be found in bulge stars, and which are independent of adopted IMF.
Brocato Enzo
Matteucci Francesca
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