Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97...33c&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 33-35. In French.
Astronomy and Astrophysics
Astrophysics
Abundance, Globular Clusters, Metallic Stars, Milky Way Galaxy, Halos, Heavy Elements
Scientific paper
The correlation between heavy element abundance in Galactic clusters and their galactocentric position is studied. Because of the variation of the dispersion of the Fe/H abundance ratio with galactocentric distance (Kinman, 1959) or of Q with velocity (Van den Bergh, 1967), it was difficult to obtain a good gradient of metallicity for the system of globular clusters. It is shown that the mixing of metal-poor and comparatively metal-rich clusters near the galactic center (radius less than 10 kpc) may be a dynamical effect caused by the noncircularity of their orbits. Three models of potential are used to represent the Galaxy: those of Innanen (1966), Ostriker and Caldwell (1978) and Bahcall and Soneira (1980). The different types of clusters are separated by the use of energy as a parameter. A graph is obtained that could be used as a relation between energy and metallicity. Furthermore, it is shown that a better relation is difficult to obtain because of the lack of tangential velocities.
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