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From the ashes: JVLA observations of water fountain nebula candidates show the rebirth of IRAS 18455+0448
W. H. T. Vlemmings, N. Amiri, H. J. van Langevelde +1
[abridged] The class of water fountain nebulae is thought to represent the stage of the earliest onset of collimated bipolar outflows during the post-Asymptotic Giant Branch phase.…
Magnetic fields around evolved stars: further observations of HO maser polarization
M. L. Leal-Ferreira, W. H. T. Vlemmings, A. Kemball +1
We aim to detect the magnetic field and infer its properties around four AGB stars using HO maser observations. The sample we observed consists of the following sources: the se…
Rotten Egg Nebula: The magnetic field of a binary evolved star
M. L. Leal-Ferreira, W. H. T. Vlemmings, P. J. Diamond +3
Most of PNe are not spherical. The loss of spherical symmetry occurs somewhere between the AGB and PN phase. The cause of this change of morphology is not yet well known, but magne…
VLBA SiO maser observations of the OH/IR star OH 44.8-2.3: magnetic field and morphology
N. Amiri, W. H. T. Vlemmings, A. J. Kemball +1
SiO maser emission occurs in the extended atmosphere of evolved stars and can be studied at high angular resolution. Very long baseline interferometry (VLBI) observations of Mira v…
The magnetic field of the evolved star W43A
N. Amiri, W. H. T. Vlemmings, H. J. van Langevelde
The majority of the observed planetary nebulae exhibit elliptical or bipolar structures. Theoretical modeling has indicated that magnetically collimated jets may be responsible for…