The Hα stellar and interstellar emission in the open cluster NGC 6910 J. Kubát, D. Korčáková, A. Kawka, A. Pigulski, M. Šlechta and P. Škoda A&A, 472 1 (2007) 163-167 Published online: 02 July 2007 DOI: 10.1051/0004-6361:20077171