Photometry of variable stars with periods near 1 day

Accurate, well-sampled light curves have been obtained for seven stars which were candidates for short period type II Cepheids. One of the stars, CM UMa, was found to have an erroneous period. The correct period is 0.589 day and the star is an RRab star. The Fourier decomposition coefficients for the light curve of KP Cyg (period=0.86 day) combined with its high metallicity are consistent with its being either a type II Cepheid or an RR Lyrae star. The result for V486 Her (period-0.8 day) is inconclusive; it is probably an RRab star. The Fourier coefficients showed that CE Her (period=1.21 day) and XX Vir (period=1.35 day) are type II Cepheids as suspected. Both stars show excess scatter and rapid variations during declining light. BB Gem has Fourier coefficients which are appropriate to a short period classical Cepheid. (author)