SIMBAD references

Differential Strömgren uvby observations obtained with the Four College Automated Photoelectric Telescope (FCAPT) are presented for the magnetic chemically peculiar (mCP) stars 36 Aur, HR 2722, 13 And, and HD 220147. The new data help to better define the light curves. The period for 36 Aur was found to be 14.368 days, close to that for the previous study with FCAPT data. The period for HR 2722 is unchanged, at 2.31523 days. Comparisons between Hipparcos and FCAPT photometry were used to refine the periods individually derived by each source to 1.47931 days for 13 And and to 10.983 days for HD 220147.