Constraining the ages of the fireballs in the wake of the dIrr galaxy VCC 1217/IC 3418 Mattia Fumagalli, G. Gavazzi, R. Scaramella and P. Franzetti A&A, 528 (2011) A46 Published online: 28 February 2011 DOI: 10.1051/0004-6361/201015463