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abstract
Naked T Tauri stars are among the most numerous of all pre-main sequence stars. The large number of these stars allows for statistical analysis of the distribution of period with respect to mass, radius and age. We present partial results from our second season of BVRI monitoring of naked T Tauri stars for rotational periods. Observations were carried out in December 1993 from KPNO and Lowell Observatory. We monitored 20 stars.
We will present rotation periods for 16 stars in the Orion OB1 association. Periods range from 0.6 days to 4.2 days with a mean of 1.65 days. This mean is significantly smaller than results reported by other authors (cf. 4.1 days Bouvier \etal ~1993). We consider two possibilities for this discrepancy; either our increased sampling rate made us more sensitive to shorter periods, or there is an inherent difference in the spin rates of Orion stars when compared with Taurus stars.
The 0.6 day period is one of the shortest known for any PMS star.
