Active asteroid belt causes the UXOR phenomenon in RZ Piscium W. J. de Wit, V. P. Grinin, I. S. Potravnov, D. N. Shakhovskoi, A. Müller and M. Moerchen A&A, 553 (2013) L1 Published online: 26 April 2013 DOI: 10.1051/0004-6361/201220715