Rotation Periods of Low-Mass Stars of the Upper Scorpius OB Association

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Abstract
We present results from a rotation period study of 21 pre–main-sequence stars in the Upper Scorpius OB association. Eleven stars have periodic variability consistent with stellar rotation. We discuss the period-searching methods and false-alarm probability calculations. Since the pre–main-sequence population of the Upper Sco region has not been examined as thoroughly as those of other star-forming regions, we compare our results with the Taurus-Auriga and Trapezium star-forming regions. We note a different distribution of Prot in Upper Sco. We use the Prot distribution to estimate the stellar spin-up times in this association.