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Distances of Stars by mean of the Phase-lag Method

Published online by Cambridge University Press:  16 July 2018

Sandra Etoka ,
Dieter Engels ,
Eric Gérard  and
Anita M. S. Richards
Sandra Etoka
Affiliation:
Jodrell Bank Centre for Astrophysics, University of Manchester, UK email: Sandra.Etoka@googlemail.com Hamburger Sternwarte, Universität Hamburg, Germany
Dieter Engels
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Germany
Eric Gérard
Affiliation:
GEPI, Observatoire de Paris-Meudon, France
Anita M. S. Richards
Affiliation:
Jodrell Bank Centre for Astrophysics, University of Manchester, UK email: Sandra.Etoka@googlemail.com
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Abstract

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Variable OH/IR stars are Asymptotic Giant Branch (AGB) stars with an optically thick circumstellar envelope that emit strong OH 1612 MHz emission. They are commonly observed throughout the Galaxy but also in the LMC and SMC. Hence, the precise inference of the distances of these stars will ultimately result in better constraints on their mass range in different metallicity environments. Through a multi-year long-term monitoring program at the Nancay Radio telescope (NRT) and a complementary high-sensitivity mapping campaign at the eMERLIN and JVLA to measure precisely the angular diameter of the envelopes, we have been re-exploring distance determination through the phase-lag method for a sample of stars, in order to refine the poorly-constrained distances of some and infer the currently unknown distances of others. We present here an update of this project.

Keywords

masersstars: late-typestars: variables: OH/IRstars: distances
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. 381 - 384
Copyright
Copyright © International Astronomical Union 2018 

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