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In this paper, the period evolution of the rotating chemically peculiar starV473\,Tau (A0Si, V = 7.26 mag) is investigated. Even though the star has beenobserved for more than fifty years, for the first time four consecutive yearsof space-based data covering between 2007 and 2010 is presented. The data isfrom the {\sl STEREO} satellite, and is combined with the archival results. Theanalysis shows that the rotation period of V473\,Tau is $1.406829(10)$ days,and has slightly decreased with the variation rate of -0.11(3)~s~yr$^{-1}$ overtime. Also, the acceleration timescale of the star is found to be around$-1.11(63) \times 10^6$~yr, shorter than its main sequence lifetime($9.26(1.25) \times 10^8$~yr). This indicates that the process of decrease inperiod might be reversible. On this basis, it can be suggested that V473\,Tauhas a possible magnetic breaking and a differential rotation, which cause avariation in the movement of inertia, and hence the observed period change.

The Period Evolution of the Chemically Peculiar Star V473 Tau