TYPE II CEPHEID CANDIDATES. IV. OBJECTS FROM THE NORTHERN SKY VARIABILITY SURVEY

We have obtained VR photometry of 447 Cepheid variable star candidates with declinations north of ?14?30', most of which were identified using the Northern Sky Variability Survey (NSVS) data archive. Periods and other photometric properties were derived from the combination of our data with the NSVS data. Atmospheric parameters were determined for 81 of these stars from low-resolution spectra. The identification of type?II Cepheids based on the data presented in all four papers in this series is discussed. On the basis of spectra, 30 type?II Cepheids were identified while 53 variables were identified as cool, main sequence stars and 283 as red giants following the definitions in Paper?III. An additional 30 type?II Cepheids were identified on the basis of light curves. The present classifications are compared with those from the Machine-learned All Sky Automated Survey Classification Catalog for 174 stars in common.