Release 11.12 ("Hergest Ridge")
Release 11.12 ("Hergest Ridge")
| Article ID: gc435 | |
| Author | Zinn, R. |
| Title | The globular cluster system of the Galaxy. II - The spatial and metallicity distributions, the second parameter phenomenon, and the formation of the cluster system |
| Journal | Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 602-617. |
| Year of publication | 1980 (on gclusters from 2014-01-20 10:49:11 ) |
| Abstract | Metal abundance measurements that were made for 84 globular clusters are used to describe the cluster system of the Galaxy. There is a metal abundance gradient between the clusters within 9 kpc of the galactic center and the clusters more distant than 9 kpc. There is a metal abundance gradient with distance from the galactic plane among the clusters within 9 kpc of the galactic center. The strength of the second parameter phenomenon varies systematically with galactocentric distance; hence regardless of whether this phenomenon is caused by age or composition variations, it is related to the large-scale evolution of the Galaxy. If age is the second parameter, then the outer halo clusters formed later over a longer period of time than the metal-poor clusters in the inner halo. |
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