Chemical compositions of stars in two stellar streams from the Galactic thick disk
arXiv:1207.0767 · doi:10.1111/j.1365-2966.2012.21677.x
Abstract
We present abundances for 20 elements for stars in two stellar streams identified by Arifyanto & Fuchs (2006, A&A, 449, 533): 18 stars from the Arcturus stream and 26 from a new stream, which we call AF06 stream, both from the Galactic thick disk. Results show both streams are metal-poor and very old (1014 Gyrs) with kinematics and abundances overlapping with the properties of local field thick disk stars. Both streams exhibit a range in metallicity but with relative elemental abundances that are identical to those of thick disk stars of the same metallicity. These results show that neither stream can result from dissolution of an open cluster. It is highly unlikely that either stream represents tidal debris from an accreted satellite galaxy. Both streams most probably owe their origin to dynamical perturbations within the Galaxy.
10 figures, Accepted for publication in MNRAS
References in corpus (6)
- Multi-Element Abundance Measurements from Medium-Resolution Spectra. II. Catalog of Stars in Milky Way Dwarf Satellite Galaxies
- Is the Milky Way ringing? The hunt for high velocity streams
- Disentangling the Hercules stream
- Chemically Tagging the HR1614 Moving Group
- Stellar Kinematic Constraints on Galactic Structure Models Revisited: Bar and Spiral Arm Resonances
- On the metallicity of open clusters I. Photometry
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