Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.6504k&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #65.04; Bulletin of the American Astronomical Society, Vol. 28, p.931
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Our ongoing survey for cool carbon stars in the outer halo of the Large and Small Magellanic Clouds (LMC, SMC) has resulted in the discovery of several hundred previously unidentified carbon stars. Spectra and radial velocities were obtained, at a resolution of 2.5 Angstroms, at the du Pont telescope. This dataset provides an excellent kinematic probe of the dynamics of the LMC-SMC-Galaxy interaction. In this presentation we will discuss the results we have obtained for the rotation curve of the Large Magellanic Cloud out to a radius of 10 degrees. Our main conclusions are that: beyond 5 degrees the rotation amplitude declines slowly, with a maximum value obtained for radius of 4--5 degrees; there are strong indications of perturbations in the velocity field in the inner parts of the SW of the LMC and the outer regions to the NE; the velocity dispersion with respect to a circular rotation curve is roughly constant as a function of radius; the kinematic line of nodes is approximately constant for all toroidal zones between 4--8 degrees radius for transverse velocities in the range 150--300 km/s. Assuming circular rotation and an inclination between 27--33 degrees, implies that the total mass in the LMC out to a radius of 10 degrees is ~ 6 x 10(9M_sun) and the majority of this mass is located within the inner 5 degrees. This suggests that the mass:to:light ratio of the LMC is ~4 and that the LMC does not possess a massive dark halo.
Demers Serge
Irwin Mary Jane
Kunkel William E.
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