Metallicity distribution and abundance ratios in the stars of the Galactic bulge
Metallicity distribution and abundance ratios in the stars of the Galactic bulge
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DOI：
10.1086/169508
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发表时间：
1990-12
期刊：
影响因子：
--
通讯作者：
F. Matteucci;E. Brocato
中科院分区：
文献类型：
--
作者：
F. Matteucci;E. Brocato
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. 19 refs.
