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Moving Groups in the Galactic Disc

Published online by Cambridge University Press:  06 January 2014

P. Ramya  and
B. E. Reddy
P. Ramya
Affiliation:
Indian Institute of Astrophysics, Bengaluru 560034, India email: [email protected]
B. E. Reddy
Affiliation:
Indian Institute of Astrophysics, Bengaluru 560034, India email: [email protected]
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Abstract

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We present results of chemical abundance study of a few representative stellar streams of Galactic thick and thin discs. Arcturus stream, which was proposed to have an extragalactic origin, and a recently detected stream called AF06 were studied. Results show a range of metallicity, age and abundance pattern that are consistent with those of Galactic thick disc component. We found similar results for AF06. The abundance and age results unambiguously rule out the possibility that the member stars are vestiges of open clusters. Abundance results of a sample of stars of Sirius and Hercules streams combined with the kinematics show that both the streams belong to the thin disc component. Also, results rule out these are remnants of open clusters. It is likely these streams formed insitu due to perturbations caused by non-axisymmetric components such as bar or spirals.

Keywords

Galaxy: abundancesGalaxy: discGalaxy: kinematics and dynamicsGalaxy: evolutionstars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S298: Setting the scene for Gaia and LAMOST , May 2013 , pp. 77 - 82
Copyright
Copyright © International Astronomical Union 2014 

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