Long-term starspot evolution, activity cycle and orbital period variation of RT Lacertae A. F. Lanza, S. Catalano, M. Rodonò, C. İbanoǧlu, S. Evren, G. Taş, Ö. Çakırlı and A. Devlen A&A, 386 2 (2002) 583-605 Published online: 15 May 2002 DOI: 10.1051/0004-6361:20020301