SIMBAD references

We investigated the variability of the BIa supergiants HD 4841 and HD 194279 using Stroemgren photometry obtained with the Four College Automated Photoelectric Telescope, Arizona and the 0.4-m telescope of TUeBITAK National Observatory (TUG), Turkey. Both stars are definitely variable with amplitudes of order 0.10 mag in u, v, b and y. The Turkish photometry with several observations per night suggests a more rapid variability than the once per night American photometry. The periods of variability are likely to be of the order of one day.