OXYGEN AND CARBON RICH COOL STARS IN THE CEPHEUS REGION: CLASSIFICATION OF SELECTED OBJECTS FROM KP2001 CATALOGUE. I

We present moderate resolution CCD spectra and R photometry for seven KP2001 stars. We revised the spectral classification of the stars in the range lambda lambda 4000-8700 angstrom. Our photometric data confirmed the behavior of the light curves downloaded from the NSVS (Northern Sky Variability Survey) database. For KP2001-32, presented as a Mira-type variable in NSVS, we estimated absolute bolometric M(b) and K-band M(K) magnitudes as well as the distance using the period-luminosity relations. We also estimated the mass loss rate using the calibration relations between mass loss rate and K - [12] index. From the position in infrared color-color diagrams, we confirmed the photometric classification of KP2001-221 as a semiregular variable, based on the light curve of the NSVS database. For the N-type carbon star KP2001-77 we estimated distance and absolute magnitude M(K) using different calibration methods. For the remaining four objects we derived the absolute magnitudes and distances using our CCD spectra and published JHK(S) magnitudes. We discuss the nature of these objects on the basis of the obtained results.