Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..416o&link_type=abstract
NOAO Proposal ID #2007B-0416
Physics
Scientific paper
We propose to use the CTIO 4-m telescope and Hydra spectrograph to measure velocites for ~4500 LMC carbon stars and red supergiants (RSGs). Our pointings uniformly sample the entire H I disk of the LMC, covering significant area untouched by previous velocity surveys. These data will allow us to investigate a number of important issues concerning the LMC's kinematics. First, our recent analysis of existing carbon star velocities shows that ~10% of the carbon stars are tidally disturbed, the first instance in which stellar tidal streams drawn out of the LMC have been identified. Tracing these tidal streams in greater detail is critical for a clear understanding of the LMC's internal kinematics. Second, the dynamical centers derived from existing carbon star and H I gas observations differ by >1° on the sky, a discrepancy that may be due to perturbed kinematics in either the carbon stars or the H I, or both. Finally, all previous analyses of the LMC's kinematics have assumed that the LMC's stars and gas are on circular orbits. Our recent analysis indicates, however, that the LMC's disk is significantly lopsided, requiring predominantly eliptical orbits. We propose to investigate all of these issues with a large, uniformly sampled kinematic sample.
Blum Robert
Gordon Karl
Harris Jason
Meixner Margaret
Oey Sally
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