ROSAT PSPC/HRI observations of the open cluster NGC 2422 M. Barbera, F. Bocchino, F. Damiani, G. Micela, S. Sciortino, F. Favata and F. R. Harnden Jr. A&A, 387 2 (2002) 463-478 Published online: 13 May 2002 DOI: 10.1051/0004-6361:20020380