The Chemical Composition of Globular Clusters of Different Nature in our Galaxy
| Autor: | Marsakov, V. A., Koval', V. V., Gozha, M. L. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Astronomy Reports, 2019, Vol. 63, No. 4, pp. 274-288 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1134/S1063772919040048 |
| Popis: | A catalog of Galactic globular clusters has been compiled and used to analyze relations between the chemical and kinematic parameters of the clusters. The catalog contains positions, distances, luminosities, metallicites, and horizontal-branch morphology indices for 157~globular clusters, as well as space velocities for 72~globular clusters. For 69~globular clusters, these data are suppleented with the relative abundances of 28~chemical elements produced in various nuclear-synthesis processes, taken from 101~papers published between 1986 and 2018. The tendency for redder horizontal branches in low-metallicity accreted globular clusters is discussed. The discrepancy between the criteria for cluster membership in the thick-disk and halo subsystems based on chemical and kinematic properties is considered. This is manifest through the fact that all metal-rich ($\rm{[Fe/H]} > -1.0$) clusters are located close to the center and plane of the Galaxy, regardless of their kinematic membership in particular Galaxy subsystems. An exception is three accreted clusters lost by a dwarf galaxy in Sagittarius. At the same time, the fraction of more distant clusters is high among metal-poorer clusters in any kinematically selected Galactic subsystem. Comment: 21 pages, 4 figures, 2 tables |
| Databáze: | arXiv |
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