Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-06-06
Astrophys.J. 454 (1995) 788
Astronomy and Astrophysics
Astrophysics
uuencoded compressed Postscript, 59 pages including 10 figures. Also available at http://www.dao.nrc.ca/DAO/SCIENCE/science.ht
Scientific paper
10.1086/176532
B,V CCD frames have been used to derive surface brightness profiles for NGC 3201 out to ~18 arcmin. A total of 857 radial velocities with median precision ~1 km/s for 399 member giants have been used to trace the velocity dispersion profile out to 32' (the approximate tidal radius from fits of single-mass, isotropic King-Michie models to the cluster surface brightness profiles). The median difference in radial velocity for stars on either side of an imaginary axis moved through the cluster in 1 degree steps shows a significant maximum amplitude of 1.22+/-0.25 km/s. We discuss possible explanations of this result, including: (1) cluster rotation; (2) preferential stripping of stars on prograde orbits near the limiting radius; (3) the projection of the cluster space velocity onto the plane of the sky and (4) a slight drift in the velocity zero point. It is difficult to identify the primary cause of the observed velocity field structure unambiguously, and we suspect that all of the above processes may play a role. The B,V surface brightness profiles and radial velocities have been modeled with single- & multi-mass King-Michie models and nonparametric techniques. The density and M/L profiles show good agreement over 1.5
Cote' Patrick
Fischer Philippe
Gebhardt Karl
Welch Douglas L.
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