Stellar substructures in the solar neighbourhood: IV. Kinematic Group 1 in the Geneva-Copenhagen survey

A combined study of kinematics and chemical composition of stars is one of the most promising tools of research in Galaxy formation. The main goal in this field of research is to reconstruct the formation history of our Galaxy, to reveal the origin of the thick disc, and to find remnants of ancient...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2015-04, Vol.576, p.A113
Main Authors: Zenoviene, R, Tautvaisiene, G, Nordstrom, B, Stonkute, E, Barisevicius, G
Format: Article
Language:English
Subjects:
Acquisitions
Chemical composition
Formations
Kinematics
Origins
Searching
Signatures
Stars
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Summary:A combined study of kinematics and chemical composition of stars is one of the most promising tools of research in Galaxy formation. The main goal in this field of research is to reconstruct the formation history of our Galaxy, to reveal the origin of the thick disc, and to find remnants of ancient mergers. We determine detailed elemental abundances in stars belonging to the so-called Group 1 of the Geneva-Copenhagen survey (GCS) and compare the chemical composition with the Galactic thin and thick-disc stars, with the GCS Group 2 and Group 3 stars, as well as with several kinematic streams of similar metallicities. The aim is to search for chemical signatures that might give information about the formation history of this kinematic group of stars. The similar chemical composition of stars in Group 1, as well as in Group 2 and 3, with that in stars of the thick disc might suggest that their formation histories are linked. A gasrich satellite merger scenario is proposed as the most likely origin.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201425088