The pre-main-sequence star IP Persei A. S. Miroshnichenko, K. S. Bjorkman, E. L. Chentsov, V. G. Klochkova, R. O. Gray, P. García-Lario and J. V. Perea Calderón A&A, 377 3 (2001) 854-867 Published online: 15 October 2001 DOI: 10.1051/0004-6361:20010958