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Water Maser Emission Around Low/Intermediate Mass Evolved Stars

M.L. Leal-Ferreira ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; P.J. Diamond ; A Kemball ; N. Amiri ; J.-F. Desmurs
Proceedings of the International Astronomical Union; Cosmic Masers - from OH to Ho (1743-9213). Vol. 8 (2012), S287, p. 79 - 80.
[Konferensbidrag, övrigt]

We present results of Very Long Baseline Array (VLBA) polarimetric 22 GHz H2O maser observations of a number of low/intermediate mass evolved stars. We observed 3 Miras (Ap Lyn, IK Tau and IRC+60370), 1 semi-regular variable (RT Vir) and 1 pPN (OH231.8+4.2). Circular polarization is detected in the H2O maser region of OH231.8+4.2 and we infer a magnetic field of |B||| = ~45 mG. This implies an extrapolated magnetic field of ~2.5 G on the surface of the central star. The preliminary results on RT Vir and IRC+60370 also indicate the first detection of weak H2O maser linear polarization.

Nyckelord: masers; magnetic fields; polarization; stars: AGB and post-AGB


M. L. Leal-Ferreira, W. H. T. Vlemmings, P. J. Diamond, A. Kemball, N. Amiri and J.-F. Desmurs (2012). Water Maser Emission Around Low/Intermediate Mass Evolved Stars. Proceedings of the International Astronomical Union, 8, pp 79-80 doi:10.1017/S1743921312006680



Denna post skapades 2012-10-31. Senast ändrad 2015-02-16.
CPL Pubid: 165350

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur