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Abundances and Chemical Evolution of the Galactic Center

Published online by Cambridge University Press:  12 April 2016

Jean Audouze
Jean Audouze*
Affiliation:
Radio Astronomy Department Observatoire de Meudon and Laboratoire René Bernas, Orsay – France

Abstract

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From observations of the galactic center using various techniques radioastronomy, millimeter waves (molecules) – infrared and gamma rays, the interstellar matter of this region* appears to have been strongly processed into stars : the gas density is much lower than in the solar neighbourhood. From CO measurements one knows that there are many molecular clouds such as SgrB2 where stars are forming now. From IR measurements, there are some indication that low mass stars are relatively more numerous in such regions than in the external regions of the galaxy. Finally the heavy element abundances show three important features (i) the possibility of strong enhancements in elements such as N and in a less extent 0 and Ne (the so called abundance gradients), (ii) Some specific enhancements of isotopes such 43C, 44N and also 47O relative to 42C, 45N and 43O (iii) Deuterium seems to have a lower abundance than in other parts of the galaxy such as the solar neighbourhood. Simple models of chemical evolution have been designed to account for such features and are rewiewed here.

Type
Part II: Evolution of the Central Parts of the Galaxy
Information
International Astronomical Union Colloquium , Volume 45: Chemical and Dynamical Evolution of our Galaxy , September 1977 , pp. 79 - 101
Copyright
Copyright © Geneva Observatory 1977

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