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Rapidly evolving episodic outflow in IRAS 18113-2503: Clues to the ejection mechanism of the fastest water fountain

AuthorsOrosz, G.; Gómez Rivero, José Francisco ; Imai, H.; Tafoya, D.; Torrelles, José María ; Burns, R.A.; Frau, P.; Guerrero, Martín A. ; Miranda, Luis F. ; Pérez-Torres, Miguel A. ; Ramos-Larios, G.; Rizzo, J.R.; Suárez, O.; Uscanga, L.
Stars: AGB and post-AGB
Stars: jets
Stars: individual (IRAS 18113-2503)
Binaries: general
Issue Date2019
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society: Letters 482(1): L40- L45 (2019)
AbstractWater fountains are evolved stars showing early stages of collimated mass-loss during transition from the asymptotic giant branch, providing valuable insight into the formation of asymmetric planetary nebulae. We report the results of multi-epoch VLBI observations, which determine the spatial and three-dimensional kinematic structure of HO masers associated with the water fountain IRAS 18113-2503. Themasers trace three pairs of high-velocity (~150-300 km s) bipolar bow shocks on a scale of 0.>18 (~2000 au). The expansion velocities of the bow shocks exhibit an exponential decrease as a function of distance from the central star, which can be explained by an episodic, jet-driven outflow decelerating due to drag forces in a circumstellar envelope. Using our model, we estimate an initial ejection velocity ~840 km s, a period for the ejections ~10 yr, with the youngest being ~12 yr old, and an average envelope density within the HO maser region n ≈10 cm. We hypothesize that IRAS 18113-2503 hosts a binary central star with a separation of ~10 au, revealing novel clues about the launching mechanisms of high-velocity collimated outflows in water fountains.© 2018 The Author(s).
Identifiersdoi: 10.1093/mnrasl/sly177
issn: 1745-3933
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