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A detailed study toward the Water fountain IRAS 15445-5449

Published online by Cambridge University Press:  16 July 2018

Andrés F. Pérez-Sánchez ,
Rebeca García López ,
Wouter Vlemmings  and
Daniel Tafoya
Andrés F. Pérez-Sánchez
Affiliation:
European Souther Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile email: aperezsa@eso.org
Rebeca García López
Affiliation:
Dublin Institute for Advance Studies, 31 Fitzwilliam Place, Dublin 2, Ireland
Wouter Vlemmings
Affiliation:
Department of Space, Earth and Environment, Chalmers University of technology, Onsala Space Obsevatory, 439 92 Onsala, Sweden.
Daniel Tafoya
Affiliation:
Department of Space, Earth and Environment, Chalmers University of technology, Onsala Space Obsevatory, 439 92 Onsala, Sweden.
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Abstract

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Post-Asymptotic giant branch (post-ABG) sources with high-velocity spectral features of H2O maser emission detected toward their circumstellar envelopes (CSEs) are known as Water Fountain (WF) nebulae. These are low- or intermediate-mass Galactic stellar sources that are undergoing the late stages of an intense mass-loss process. The velocity and the spatial distribution of the H2O maser spectral features can provide information about the kinematics of the molecular gas component of their CSEs. Hence, observational studies toward WF nebulae could help to better understand the formation of the asymmetric structures (hundred to thousand AUs) commonly seen toward Planetary nebulae (PNe). Here we present preliminary results of observations done toward the WF IRAS 15445-5449 using the Australia Telescope Compact Array (ATCA) and the Very Large Telescope (SINFONI/VLT). Assuming that the pumping of the H2O maser transitions is a consequence of shocks between different velocity winds, the spatial distribution of the emission shed light on the scales of the regions affected by the propagation of the shock-fronts.

Keywords

stars: AGB and Post-AGBMasersstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 355 - 358
Copyright
Copyright © International Astronomical Union 2018 

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