1916 20160701171655.0 ASTROimport-73 Waelkens, C. 1990 Geneva photometry of stars in the double cluster H and Chi Persei Results are presented of a campaign of photometric observations of stars in the double cluster h and Chi Persei that spanned eight years. The long-time scale of the data has made it possible to discover that at least half of the brighter stars in h and Chi Persei are variable stars. It appears that most of these variables are Be stars or related objects. Accurate color-magnitude diagrams for the brightest stars of the double cluster show that the reddening is not as uniform as was assumed so far; that the observed parameters of many stars are very much affected by the high rotational velocities, and thus cannot be easily interpreted in terms of physical quantities; and that the reported age and distance differences of both clusters are probably spurious. It is noted that the large intrinsic scatter of the colors and magnitudes of the h and Chi Persei stars casts doubt on the validity of photometric calibrations that rely heavily on observations of the double cluster. Lampens, P. Heynderickx, D. Cuypers, J. Degryse, K. Poedts, S. Polfliet, R. Denoyelle, J. van den Abeele, K. Rufener, F. Smeyers, P. Astronomy and Astrophysics Supplement Series 83 1990 11-25 http://esoads.eso.org/abs/1990A%26AS...83...11W published in REFERD