UV and optical spectra of Y Gem. The figure includes far- and near-UV spectra from HST (magenta) and the optical INT IDS spectrum (blue), both corrected for extinction assuming A_V = 0.8 and the extinction curve by Cardelli et al. (1989). The black curve represents the best-fit spectrum from the library of stellar spectra by Lejeune et al. (1997) corresponding to T_eff = 3350 K, log g = −0.29, and [Fe/H] = 0.0. The green curve represents a blackbody distribution with T_eff = 60 000 K and L = 140 L_⊙ (R = 0.11 R_⊙).