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1612 MHz OH maser monitoring with the Nançay Radio Telescope

Published online by Cambridge University Press:  24 July 2012

D. Engels ,
E. Gérard  and
N. Hallet
D. Engels
Affiliation:
Hamburger Sternwarte, Gojenbergsweg 112, D–21029 Hamburg, Germany email: [email protected]
E. Gérard
Affiliation:
Observatoire de Paris, 5 Place J Janssen, F–92195 Meudon Cedex, France email: [email protected], [email protected]
N. Hallet
Affiliation:
Observatoire de Paris, 5 Place J Janssen, F–92195 Meudon Cedex, France email: [email protected], [email protected]
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Abstract

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20 OH/IR stars are monitored in the 1612 MHz OH maser line with the Nançay Radio Telescope. The program started in 2008 with monthly observations of the full sample and will last at least until end of 2012. The aim is the determination of the linear diameter of the circumstellar shell using the phase lag between the light curves of the varying OH maser lines. To use them for distance determinations, angular diameters are obtained by interferometric measurements while the stars pass the maximum of their OH maser flux density variations. The periods of the OH/IR stars monitored are between 425 and >2000 days.

Keywords

masersstars: AGB and post-AGBstars:late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 254 - 255
Copyright
Copyright © International Astronomical Union 2012

References

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