Subsystems of the Galactic halo, their structures and compositions
It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy. The thick disk and proto-disk subsystems are genetically associated with the Galaxy. The age distributions of these two subsyste...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Odessa I. I. Mechnykov National University
2017-03-01
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| Series: | Odessa Astronomical Publications |
| Subjects: | |
| Online Access: | http://oap.onu.edu.ua/article/view/95054 |
| _version_ | 1818994448323837952 |
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| author | V. A. Marsakov T. V. Borkova |
| author_facet | V. A. Marsakov T. V. Borkova |
| author_sort | V. A. Marsakov |
| collection | DOAJ |
| description | It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy. The thick disk and proto-disk subsystems are genetically associated with the Galaxy. The age distributions of these two subsystems do not overlap. It is argued that heavy-element enrichment and the collapse of the proto-galactic medium occurred mainly in the period between the formation of the proto-disk halo and thick disk subsystems. The largest third subsystem has no metallicity gradient, most of its objects have retrograde motion in the Galaxy, some of them have unusually low content of a-elements, and their ages are comparatively low in average, supporting the hypothesis that the objects in this subsystem had an extragalactic origin. |
| first_indexed | 2024-12-20T20:58:07Z |
| format | Article |
| id | doaj.art-97248169e0fa4079933b09ed8c0c6cba |
| institution | Directory Open Access Journal |
| issn | 1810-4215 |
| language | English |
| last_indexed | 2024-12-20T20:58:07Z |
| publishDate | 2017-03-01 |
| publisher | Odessa I. I. Mechnykov National University |
| record_format | Article |
| series | Odessa Astronomical Publications |
| spelling | doaj.art-97248169e0fa4079933b09ed8c0c6cba2022-12-21T19:26:47ZengOdessa I. I. Mechnykov National UniversityOdessa Astronomical Publications1810-42152017-03-01150526010.18524/1810-4215.2002.15.9505495054Subsystems of the Galactic halo, their structures and compositionsV. A. Marsakov0T. V. Borkova1Space Research Department at Rostov State UniversitySpace Research Department at Rostov State UniversityIt is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy. The thick disk and proto-disk subsystems are genetically associated with the Galaxy. The age distributions of these two subsystems do not overlap. It is argued that heavy-element enrichment and the collapse of the proto-galactic medium occurred mainly in the period between the formation of the proto-disk halo and thick disk subsystems. The largest third subsystem has no metallicity gradient, most of its objects have retrograde motion in the Galaxy, some of them have unusually low content of a-elements, and their ages are comparatively low in average, supporting the hypothesis that the objects in this subsystem had an extragalactic origin.http://oap.onu.edu.ua/article/view/95054globular clustersgalaxy: abundancesgalaxy: halo |
| spellingShingle | V. A. Marsakov T. V. Borkova Subsystems of the Galactic halo, their structures and compositions Odessa Astronomical Publications globular clusters galaxy: abundances galaxy: halo |
| title | Subsystems of the Galactic halo, their structures and compositions |
| title_full | Subsystems of the Galactic halo, their structures and compositions |
| title_fullStr | Subsystems of the Galactic halo, their structures and compositions |
| title_full_unstemmed | Subsystems of the Galactic halo, their structures and compositions |
| title_short | Subsystems of the Galactic halo, their structures and compositions |
| title_sort | subsystems of the galactic halo their structures and compositions |
| topic | globular clusters galaxy: abundances galaxy: halo |
| url | http://oap.onu.edu.ua/article/view/95054 |
| work_keys_str_mv | AT vamarsakov subsystemsofthegalactichalotheirstructuresandcompositions AT tvborkova subsystemsofthegalactichalotheirstructuresandcompositions |