The formation and chemical evolution of the Galactic disc

Details The formation and chemical evolution of the Galactic disc The formation and chemical evolution of the Galactic disc

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..356s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 15, 1991, p. 356-362.

Astronomy and Astrophysics

Astronomy

20

Chemical Evolution, Disk Galaxies, Galactic Evolution, Gas Cooling, Milky Way Galaxy, Star Formation, Approximation, Astronomical Models

Scientific paper

The present model of galactic disk formation via protogalactic cooling inflow of gas uses the observed baryonic mass and spin of the Milky way to fix the free parameters. Under the assumption that the Milky Way began to form 15 Gyr ago, the solar cylinder would have begun to form, after a period of a few Gyr, through an about 2-Gyr process of gas infall. This theory implies, consistent with observations, that the first halo stars in the inner halo formed before the first local disk stars. The Wyse and Silk (1989) star-formation prescription is used to determine the Galactic disk's chemical evolution; this has reproduced the oxygen abundance distribution of G-dwarfs in the solar cylinder.

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