Luminous AGB stars in nearby galaxies - A study using virtual observatory tools P. Tsalmantza, E. Kontizas, L. Cambrésy, F. Genova, A. Dapergolas and M. Kontizas A&A, 447 1 (2006) 89-95 Published online: 27 January 2006 DOI: 10.1051/0004-6361:20053142