Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76..346c&link_type=abstract
Astronomy and Astrophysics, vol. 76, no. 3, July 1979, p. 346-349. Research supported by the Alfred P. Sloan Foundation.
Astronomy and Astrophysics
Astrophysics
2
Density Distribution, Density Wave Model, Gas Density, Milky Way Galaxy, Star Formation, Abundance, Interstellar Gas, Metals, Radial Distribution
Scientific paper
By assuming that the stellar birthrate in the Galaxy is controlled by the rate of encounters of gas with a spiral density wave, the variation of the gas fraction with galactocentric distance has been computed. Models in which the birthrate depends on time through the gas density give a much steeper radial variation than is observed and cannot be used for fitting the observed radial abundance gradients. A time-independent birthrate controlled by the density wave requires an unphysical coincidence between the initial gas-consumption time scale and the present age of the galactic disk in order to obtain agreement with the observed gas fraction. It is concluded that either the birthrate is not primarily controlled by the density wave or strong radial flows must exist in the galactic disk.
Cass'e Michel
Kunth Daniel
Scalo John M.
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