Sensitive CO and<sup>13</sup>CO survey of water fountain stars
Sensitive CO and<sup>13</sup>CO survey of water fountain stars
Water fountain stars represent a stage between the asymptotic giant branch (AGB) and planetary nebulae phases, when the mass loss changes from spherical to bipolar. These types of evolved objects are characterized by high-velocity jets in the 22 GHz water maser emission. We surveyed the CO and 13CO line emission …