Massive stars in the SDSS-IV/APOGEE SURVEY. I- OB stars
  In this work we make use of DR14 APOGEE spectroscopic data to study a sample
of 92 known OB stars. We developed a near-infrared semi-empirical spectral
classification method that was successfully used in case of four new exemplars,
previously classified as later B-type stars. Our results agree well with those
determined independently from ECHELLE optical spectra, being in line with the
spectral types derived from the "canonical" MK blue optical system. This
confirms that the APOGEE spectrograph can also be used as a powerful tool in
surveys aiming to unveil and study large number of moderately and highly
obscured OB stars still hidden in the Galaxy.
