SIMBAD references

The orbital elements of twelve binary stars, derived from recent visual and interferometric observations, are given in this paper. Six of them are new (ADS 3241, 7316, 7651, 9547, Mac Alister 33 and 50); the six others are revised orbits (ADS 2538, 6776, 8485, 9073, 9747 and 9836). For each pair are given, with the elements, the measures and their O-C, the dynamical parallax and the mass, an ephemeris and, in Notes, a discussion of the results.