SIMBAD references

During one night in 2005 and 21 nights in 2011 we secured a new complete light curve of the semi-detached eclipsing binary TW Dra, for first time reduced to the standard UBV system. We analysed these observations and combined them with recently published high-S/N spectroscopy to derive improved physical properties of the system. Our individual observations are provided in electronic form for more detailed analyses by interested investigators. We find that the primary of the eclipsing pair is either slightly evolved away from the main sequence or has a pseudophotosphere, which mimics a later spectral type. This speculation should be further investigated via dedicated spectroscopic studies.