Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21731102s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #311.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present high resolution spectra measurements for Lanthanum, Europium, and Iron in 700 stars in the solar neighborhood. The bulk of our data are planet search spectra taken with HIRES on the Keck I telescope at R=50,000. A small subset of kinematically selected stars were observed on the Harlan J. Smith Telescope at McDonald Observatory at R=60,000 and S/N 100 at the 3988 Å Lanthanum line and S/N 250 around 5240 Å near the Iron lines. Statistical analyses of stellar kinematics in the solar neighborhood reveal much kinematic substructure in the disk, though it is not readily apparent whether this substructure is extragalactic or dynamical in origin. Much of the substructure can be quickly identified as well known moving groups of stars such as the Hercules, Sirius, and Hyades stellar streams. Additionally, our subset of kinematically selected stars observed at McDonald Observatory are members of a stellar stream putatively identified by Amina Helmi as part of a merger remnant. Taking advantage of a large data set and a homogenous spectral analysis, we apply a Kolmogorov-Smirnov hypothesis test to investigate the possibility that these kinematic structures are chemically distinct from the Galactic Disk.
Carney Bruce W.
Stringer Christopher
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