Oxygen-Rich Cool Stars in the Cepheus Region. New Observations. III

We present moderate-resolution CCD spectra and R photometry for seven KP2001 stars. We revised the spectral classification of the stars in the range λ λ3900 ‑ 8500Å . On the bases of light curves of the NSVS (Northern Sky Variability Survey) database, we classify KP2001-18 as a semiregular and KP2001-176 as Mira type variables. For all observed objects NSVS phase-dependence light curve analysis and variability type classification was performed with the VStar Software. Using the period-luminosity relation, we estimated the absolute bolometric M_bol and K-band M_k magnitudes as well as the distances to variables.