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The evolution of the galaxy: the 16O Gradient and the Surface Gas Density

Published online by Cambridge University Press:  07 August 2017

Leticia Carigi  and
Jose Franco
Leticia Carigi
Affiliation:
Centro de Inv. de Astronomía, CIDA Apdo. Postal 264 Mérida 5101-A, Venezuela
Jose Franco
Affiliation:
Instituto de Astronomía-UNAM Apdo. Postal 70-264 04510 México D. F., México

Abstract

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A series of simple analytical models for the evolution a galactic disk have been constructed. General solutions can be obtained under the assumption of pure radial gas flows, a star formation rate proportional to the nth power of the surface gas density, a constant IMF, and the instantaneous recycling approximation. Models with small radial flow velocities in the range 0.05 to 0.1 km s–1 and an initial exponential surface mass density can reproduce, for galactocentric radii larger than about 5 kpc, the Galactic 16O abundance gradient and the present surface gas distribution.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 149: The Stellar populations of Galaxies , 1992 , pp. 398
Copyright
Copyright © Kluwer 

References

Köppen, J. and Arimoto, N. 1991, Astron. Ap. Suppl. , 87, 109.Google Scholar
Franco, J. 1991, in Chemical and Dynamical Evolution of Galaxies ed. Ferrini, F., Franco, J. and Matteucci, F., (ETS Editrice; Pisa), p. 506.Google Scholar