1 research outputs found
Abundances and Kinematics of Field Stars II: Kinematics and Abundance Relationships
As an investigation of the origin of ``-poor'' halo stars, we analyze
kinematic and abundance data for 73 intermediate metallicity stars (
[Fe/H] ) 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 ``-poor'' stars, were once members of disrupted dSph
galaxies similar to those studied to date.Comment: Accepted for publication in January 2002 AJ. 29 pages, 12 figures, 2
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