The Evolution of the Milky way |
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Authors: | Gerhard Hensler |
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Institution: | 1. Institut für Theoretische Physik und Astrophysik, Universit?t Kiel, Olshausenstr. 40, D-24098, Kiel, Germany
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Abstract: | A two-dimensional chemodynamical model of the Milky Way Galaxy is presented that can account for the structural, kinematical,
and chemical pecularities of the galactic components in a self-consistent way. The dynamics of three stellar components and
the multi-phase interstellar medium consisting of clouds and intercloud gas are followed in detail. Mass interchange and energetic
interaction processes between the stars and the gas phases are treated simultaneously according to the astrophysical experience
including star formation, supernovae type I and II, planetary nebulae, stellar winds, evaporation and condensation, drag,
cloud collisions, heating and cooling, and stellar nucleosynthesis. These processes are coupling large ranges on temporal
and spatial scales, and allow for feedback and self-regulation mechanisms, which play a significant role in galactic evolution.
In comparison with observations the capability of the chemodynamical treatment is convincingly proved by the excellent agreement
with various observations. In addition, also well-known problems (G-dwarf problem, the discrepancy between local effective
yields, etc.), which so far could be only explained by artificial constraints, are solved in the global scenario. Here we
wish also to focus on temporal behaviours of the radial abundance gradient and abundance ratios in order to stimulate further
more specific observations and to make particular predictions which can test the validity of used model ingredients like stellar
yields.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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