TY - JOUR A2 - Kravtsov, Andrey V. AU - Sales, Laura V. AU - Helmi, Amina AU - Battaglia, Giuseppina PY - 2010 DA - 2010/01/03 TI - The Effect of Tidal Stripping on Composite Stellar Populations in Dwarf Spheroidal Galaxies SP - 194345 VL - 2010 AB - We use N-body simulations to study the effects of tides on the kinematical structure of satellite galaxies orbiting a Milky Way-likepotential. Here we focus on the evolution of a spherical, dark matter dominated satellite, which is modelled with two stellar componentsset ab initio to be spatially and kinematically segregated, in a way that resembles the configuration of the metal poor and metal richstellar populations in several dwarf spheroidals of the Local Group. We find that an important attenuation of the initial differences inthe distribution of the two stellar components occurs for orbits with small pericentric radii. This is mainly due to (i)the loss of the gravitational support provided by the dark matter component after tidal stripping takes place and (ii) tides preferentiallyaffect the more extended stellar component, leading to a net decrease in its velocity dispersion as a response for the mass loss, whichthus shrinks the kinematical gap. We apply these ideas to the Sculptor and Carina dwarf spheroidals. Differences in their orbits mighthelp to explain why in the former a clear kinematical separation between metal poor and metal rich stars is apparent, while in Carinathis segregation is significantly more subtle. SN - 1687-7969 UR - https://doi.org/10.1155/2010/194345 DO - 10.1155/2010/194345 JF - Advances in Astronomy PB - Hindawi Publishing Corporation KW - ER -