Newly discovered active binaries in the RasTyc sample of stellar X-ray sources - I. Orbital and physical parameters of six new binariesA. Frasca, P. Guillout, E. Marilli, R. Freire Ferrero, K. Biazzo and A. KlutschA&A, 454 1 (2006) 301-309DOI: https://doi.org/10.1051/0004-6361:20054573