By Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho

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Extra resources for 2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting

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Spectroscopy (MOS, VLT) was carried out with R = 500 in [4450-8650] A. The data were reduced according to standard procedures using IRAF. We obtained 73 galaxy spectra for CL0048-2942 and 68 spectra for both CL2245-3954 and CL22493958. Redshifts were measured according to the Tonry & Davis technique 11 . 64. 65. 56, from a total of 54 measured redshifts. 3. Stellar population synthesis We have used a population synthesis analysis to determine the stellar content (or evolutionary stage) of cluster galaxies at different radial distances from the cluster centre.

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We find that the coronal magnetic field rapidly expands to regions of low magnetic pressure creating a relatively smooth magnetic field with no memory of the surface radial field latitudinal distribution. Thus, our results indicate that this effect does not determine a reduction in the efficiency of magnetic braking. 1. Introduction Magnetic braking by a wind is based on the principle that when gas emitted from a star is kept corotating with the star by magnetic torques, it will transport significantly more angular momentum outwards than gas that conserves its angular momentum [1].

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