SIMBAD references

We discuss new results of an observation campain on the RRab star SW Bootis in 2004 and 2005 by members of the BAV. The star is already known as showing quite a large secular period change [1]. We could show that the all available data (see GEOS RR Lyrae database [2]) together with the new results can be well explained by a constant increase of the period of 1.8055 x 10-9 per day. This is less than derived by Bonov [1] but in good agreement with [6]. The revised elements of SW Bootis are: E0=2453540.49221 and P=0.513548d. In obvious contrast to the older literature we did not find an in- dication for a Blazhko effect within the limits of our observational precision. The observed fluctuations in brightness in maximum and minimum light are below 0.02 mag. Also no statistically significant (O-C)-scatter has been identified from the newer CCD measurements within the observational uncertainties. This is in contrast to older literature [3] but agrees very well with recently published remarks originating from an analysis of ROTSE data [4].