Kinematic Analysis of Subpopulations in NGC 1851 and NGC 2808

Details Kinematic Analysis of Subpopulations in NGC 1851 and NGC 2808 Kinematic Analysis of Subpopulations in NGC 1851 and NGC 2808

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915206l&link_type=abstract

American Astronomical Society, AAS Meeting #219, #152.06

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate the kinematics of two massive nearby globular clusters, NGC 1851 and NGC 2808. These clusters were chosen because existing abundance and CMD measurements provide strong evidence for multiple generations of star formation. We obtained high-resolution spectra of >1000 cluster member stars in the Mg triplet portion of the spectrum using the Magellan/MIKE fiber system. From the spectra, we extract radial velocities and relative Mg abundances to perform chemical and kinematic analyses in each cluster. Based on observed spreads in the abundances, we divide each cluster into Mg-poor and Mg-rich subpopulations for individual treatment. In each cluster, we compare the global rotation signal with that of each subpopulation, as well as the spatial distributions of the subpopulations. We compare these results to expectations from models for the formation of multiple populations in globular clusters.

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