SIMBAD references

We present the results of 22 GHz H₂O maser observations of a sample of 85 post-asymptotic giant branch (post-AGB) candidate stars, selected on the basis of their OH 1612 MHz maser and far-infrared properties. All sources were observed with the Tidbinbilla 70 m radio telescope, and 21 detections were made; 86 GHz SiO Mopra observations of a subset of the sample are also presented. Of the 21 H₂O detections, 15 are from sources that are likely to be massive AGB stars and most of these show typical, regular H₂O maser profiles. In contrast, nearly all the detections of more evolved stars exhibited high-velocity H₂O maser emission. Of the five sources seen, v223 (W43A, IRAS 18450-0148) is a well-known ``water-fountain'' source that belongs to a small group of post-AGB stars with highly collimated, high-velocity H₂O maser emission. A second source in our sample, v270 (IRAS 18596+0315), is also known to have high-velocity emission. We report the discovery of similar emission from a further three sources, d46 (IRAS 15445-5449), d62 (IRAS 15544-5332), and b292 (IRAS 18043-2116). The source d46 is an evolved post-AGB star with highly unusual maser properties. The H₂O maser emission from d62 is probably associated with a massive star. The source b292 is a young post-AGB star that is highly likely to be a water-fountain source, with masers detected over a velocity range of 210 km/s.