HS 1857+5144: a hot and young pre-cataclysmic variable A. Aungwerojwit, B. T. Gänsicke, P. Rodríguez-Gil, H.-J. Hagen, O. Giannakis, C. Papadimitriou, C. Allende Prieto and D. Engels A&A, 469 1 (2007) 297-305 Published online: 24 April 2007 DOI: 10.1051/0004-6361:20077276