SIMBAD references

Forty years ago Szeidl [1] discovered the Blazhko effect of TT Cnc. The variability of five own recently observed light curves of TT Cnc shows that the Blazhko effect is still existing with about the same extent. A Blazhko period PB[d] = 89,10 ± 0,02 was derived from 57 (O - C)-values for times of maximum light, which were calculated from photoelectric and ccd observations taken from the GEOS database [2]. This result is valid on the assumption that PB has not altered from 1968 to 2007. Interestingly, the average course of the (O - C)-values in the Blazhko phase diagram is increasing and decreasing nearly linear and the transitions between rise and fall are rather abrupt, which is very similar to the behaviour of UX Tri [7].