Abundances and Kinematics of Field Stars II: Kinematics and Abundance Relationships

Abstract

As an investigation of the origin of ``$\alpha$-poor'' halo stars, we analyze kinematic and abundance data for 73 intermediate metallicity stars ($-1>$ [Fe/H] $\ge -2$) selected from Paper I of this series. We find evidence for a connection between the kinematics and the enhancement of certain element-to-iron ([X/Fe]) ratios in these stars. Statistically significant correlations were found between [X/Fe] and galactic rest-frame velocities (\vrf{}) for Na, Mg, Al, Si, Ca and Ni, with marginally significant correlations existing for Ti and Y as well. We also find that the [X/Fe] ratios for these elements all correlate with a similar level of significance with [Na/Fe]. Finally, we compare the abundances of these halo stars against those of stars in nearby dSph galaxies. We find significant differences between the abundance ratios in the dSph stars and halo stars of similar metallicity. From this result, it is unlikely that the halo stars in the solar neighborhood, including even the ``$\alpha$-poor'' stars, were once members of disrupted dSph galaxies similar to those studied to date.

Accepted for publication in January 2002 AJ. 29 pages, 12 figures, 2 tables

References in corpus (4)

• Abundance Patterns in the Draco, Sextans and Ursa Minor Dwarf Spheroidal Galaxies
• Abundances and Kinematics of Field Halo and Disk Stars I: Observational Data and Abundance Analysis
• Kinematics of Metal-Poor Stars in the Galaxy. II. Proper Motions for a Large Non-Kinematically Selected Sample
• Evidence for the Hierarchical Formation of the Galactic Spheroid

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