Discovery of the secondary star of the HgMn binary kappa Cancri
  A careful investigation of a CCD spectrum of the SB1 system kappa Cnc in the spectral region 3800 A - 8000 A resulted in the discovery of the lines of the secondary star. We then analyzed several short-wavelength range Reticon spectra obtained at different orbital phases to find additional radial velocities. The mass ratio is m_A/m_B = 2.2 +- 0.1 and, from binary spectrum-synthesis, the ratio of radii is R_A/R_B >= 2. 
T. Ryabchikova (1), O. Kotchoukhov (2), G. Galazutdinov (3), F. Musaev   (3), S. J. Adelman (4)((1) Institute of Astronomy, ...