Hα spectroscopy and photometry of RT Lacertae A. Frasca, Ö. Çakırlı, S. Catalano, C. Ibanoǧlu, E. Marilli, S. Evren and G. Taş A&A, 388 1 (2002) 298-308 Published online: 28 May 2002 DOI: 10.1051/0004-6361:20020504