RX J1603.8-3938 -a surprising pre-main sequence spectroscopic binary E. W. Guenther, G. Torres, N. Batalha, V. Joergens, R. Neuhäuser, J. Vijapurkar and R. Mundt A&A, 366 3 (2001) 965-971 Published online: 15 February 2001 DOI: 10.1051/0004-6361:20000355