  We report an independent spectral classification of a sample of poorly
studied M-dwarf candidate stars observed with the OSIRIS instrument at GTC. Our
project was carried out as an independent test of the spectral classification.
It is crucial for the studies of extrasolar planets orbiting M-dwarfs, since
properties of the host star are directly related to understanding the planet
properties and possible habitability. Understanding of the statistical
properties of the dwarf stars is also crucial for the Simple Stellar Population
models that play a major role in the modern astrophysics. Halpha emission was
detected in 33% of the sample with evidence of Halpha variability in one
object.
