Top: spin frequency history of XTE J1946+274 since its discovery in 1988. Middle: long-term optical light curve of this source. Bottom: long-term X-ray bolometric luminosity, and overplotted the evolution of the EW of the Hα line (red stars, open square, and filled circles). The Hα EW measurements from 1999 to 2002 were extracted from (Verrecchia et al. 2002, red crosses) and Wilson et al. (2003, red triangles). To compute the X-ray bolometric luminosity we follow the procedure by Wilson et al. (2003).