The Hubble sequence of disk galaxies - A sequence of bulge-to-disk ratios

Details The Hubble sequence of disk galaxies - A sequence of bulge-to-disk ratios The Hubble sequence of disk galaxies - A sequence of bulge-to-disk ratios

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240...22k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 22-35.

Astronomy and Astrophysics

Astrophysics

44

Chemical Evolution, Disk Galaxies, G Stars, Galactic Evolution, Metallicity, Galactic Nuclei, Gravitational Effects, Star Formation, Supernovae

Scientific paper

The chemical evolution of the bulges and disks of spiral galaxies is computed. Primordial gas is accreted on a free-fall time scale into the bulge and is turned into stars similarly quickly. Star formation ceases when the gas heated by supernova explosions leaves the gravitational field of the bulge. This metal-enriched gas is mixed with primordial gas falling onto the disk. For the Galaxy, all parameters of this model can be fixed by the metallicity distributions of bulge K giants and disk G-dwarfs and the present gas fraction in the solar neighborhood. The yields of heavy elements are different in bulge and disk. The model is generalized to spiral galaxies of different Hubble types by varying the bulge-to-disk mass ratio.

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