Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990qjras..31..281t&link_type=abstract
Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 31, Sept. 1990, p. 281-304.
Astronomy and Astrophysics
Astronomy
5
Chemical Evolution, Cosmochemistry, Galactic Evolution, Abundance, Astronomical Models, Chemical Composition, Interstellar Gas, Nuclear Fusion, Star Formation
Scientific paper
The present chemical composition of a galaxy depends on the original chemical composition of gas out of which the galaxy formed, the processes of galaxy formation, star formation, stellar evolution and nucleosynthesis and mass loss from stars, and on exchange of mass between the galaxy and the intergalactic medium and within the galaxy. Many of these processes are not well understood theoretically and are also not adequately constrained by observations. A brief account is given of the observations which are relevant. This is followed by a discussion of simple models of galactic chemical evolution. It is then pointed out that the process of galaxy formation is unlikely to lead to a galactic disk which is automatically in centrifugal equilibrium. Departure from centrifugal equilibrium produces radial flows of matter, and the consequences of such radial flows, particularly with regard to abundance gradients in galaxies, are discussed.
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