Left: VVV CL086 field-star decontaminated CMD. The most probable cluster members and field stars are shown with black and grey symbols. Numbers indicate the position for the spectroscopically observed stars. Main (1.0 and 5.5 Myr, Lejeune & Schaerer 2001) and pre-main sequence (0.2, 1.0, 5.0, and 10 Myr, Siess et al. 2000) isochrones are also shown in the diagram. Right: individual spectra in K band for VVV CL086. We label the spectral lines used for the spectral classification.