CCD OBSERVATIONS OF THREE RR LYRAE-TYPE STARS: CL ERI, CM ERI, AND CN ERI

摘要

A total of 1072 B, V, and I_c-band CCD frames have been taken for three GCVS RR Lyr-type variables (CL Eri, CM Eri, and CN Eri), for which only coordinates were known. Observations were made with the 76-cm telescope of the South African Astronomical Observatory using an SBIG CCD ST-ioXME. The inferred periods and light-curves confirm that CL Eri (P = O~d-644), which was found to exhibit the Blazhko effect, and CN Eri (P = o~d-580) are RR Lyr-type variables. CM Eri is most probably a Population-II Cepheid with a period of o~d.824.