Arellano Ferro, A; Arévalo, M. J; Lázaro, C; Rey, M; Bramich, D. M; Giridhar, S
(Instituto de Astronomía, Universidad Nacional Autónoma de México, 2004-10)
We report the results of CCD V and R photometry of the RRstars known in NGC4147. The periodicities of most variables are revised and new ephemerides are calculated. The Blazhko effect has been detected in V2 and V6. Three ...