2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94914We present a principle component analysis of multicolour light variations of the He-strong magnetic chemically peculiar star HD 37776 and its (O-C) diagram. The period increase rate found, (dP/dt) / P = 5.5 x 10^{-6}/year, is consistent with the conception of angular momentum loss through magnetically confined stellar wind.3 pages; to appear in the proceedings of Active OB-Stars: Laboratories for Stellar & Circumstellar Physics, S. Stefl, S. Owocki and A. Okazaki edsAstrophysicstext