Systematic Search for Water Fountain Candidates Using the Databases of Circumstellar Maser Sources
Water fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spherically symmetric to asymmetric shapes.We used databases of circumstellar 1612 MHz OH and 22.235 GHz H _2 O maser sources to search for new WF candidates using the criterio