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Looking for new water-fountain stars

Published online by Cambridge University Press:  30 December 2019

L. Uscanga ,
J. F. Gómez ,
B. H. K. Yung ,
H. Imai ,
J. R. Rizzo ,
O. Suárez ,
L. F. Miranda ,
M. A. Trinidad ,
G. Anglada  and
J. M. Torrelles
L. Uscanga
Affiliation:
University of Guanajuato, A.P. 144, 36000 Guanajuato, Gto., Mexico email: [email protected]
J. F. Gómez
Affiliation:
IAA–CSIC, Glorieta de la Astronomía s/n, 18008 Granada, Spain
B. H. K. Yung
Affiliation:
NCAC, ul. Rabiańska 8, 87-100 Toruń, Poland
H. Imai
Affiliation:
Kagoshima University, Korimoto 1-21-24, Kagoshima 890-8580, Japan
J. R. Rizzo
Affiliation:
CAB, INTA-CSIC, Ctra de Torrejón a Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain
O. Suárez
Affiliation:
Observatoire de la Côte dAzur, CNRS, Laboratoire Lagrange, France
L. F. Miranda
Affiliation:
IAA–CSIC, Glorieta de la Astronomía s/n, 18008 Granada, Spain
M. A. Trinidad
Affiliation:
University of Guanajuato, A.P. 144, 36000 Guanajuato, Gto., Mexico email: [email protected]
G. Anglada
Affiliation:
IAA–CSIC, Glorieta de la Astronomía s/n, 18008 Granada, Spain
J. M. Torrelles
Affiliation:
ICE, CSIC, Carrer de Can Magrans, s/n 08193 Barcelona, Spain
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Abstract

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We carried out simultaneous observations of H2O and OH masers, and radio continuum at 1.3 cm with the Karl G. Jansky Very Large Array (VLA) towards 4 water-fountain candidates. Water fountains (WFs) are evolved stars, in the AGB and post-AGB phase, with collimated jets traced by high-velocity H2O masers. Up to now, only 15 sources have been confirmed as WFs through interferometric observations. We are interested in the discovery and study of new WFs. A higher number of these sources is important to understand their properties as a group, because they may represent one of the first manifestations of collimated mass-loss in evolved stars. These observations will provide information about the role of magnetic fields in the launching of jets in WFs. Our aim is to ascertain the WF nature of these candidates, and investigate the spatial distribution of the H2O and OH masers.

Keywords

masers –stars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 527 - 528
Copyright
© International Astronomical Union 2019 

References

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