Appendix B: Valinhos reference catalogues

The tables contain the recommended reference stars for the 12 low-extinction fields towards the galactic bulge. The first column of the catalog indicates the star label, formed by a number that designates the window (see Table 1) and a sequential counter. The following columns contain the mean right ascension, the corresponding standard deviation (in seconds); the mean declination, its standard deviation (in arcseconds) (J2000); the weighted average magnitude, its standard deviation and weighted error. Stars belonging to the Tycho Catalogue are indicated with a T in the first column. We stress again that, being a natural extension of the Tycho Catalogue, the Valinhos Reference Catalogue is not complete up to the given magnitude, but instead constitude a reference set which may prove useful for dedicated studies of low-extinction fields. Complete databases up to $m_{V\rm al} \, = 15.5$ or better will be available soon as a product of our monitoring programme and will be published elsewhere.