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High Resolution Radio and IR Observations of AGB Stars

Published online by Cambridge University Press:  24 July 2012

W. Cotton ,
G. Perrin ,
R. Millan-Gabet ,
O. Delaa  and
B. Mennesson
W. Cotton
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Rd., Charlottesville, VA 202903, USA email: bcotton@nrao.edu
G. Perrin
Affiliation:
LESIA, Observatoire de Paris, CNRA, UPMC, Université Paris-Diderot, Paris Sciences et Letters, 5 place Jules Janssen, 92195, Meudon, France email: guy.perrin@obspm.fr
R. Millan-Gabet
Affiliation:
California Institute of Technology, NASA Exoplanet Science Institute, Pasadena, CA 91125, USA email: R.Millan-Gabet@caltech.edu
O. Delaa
Affiliation:
Laboratoire Lagrange, UMR 7293 UNS-CNRS-OCA, Boulevard de l'Observatoire, B.P. 4229 F, 06304 NICE Cedex 4, France email: omar.delaa@oca.eu
B. Mennesson
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91190, USA email: bertrand.mennesson@jpl.nasa.gov
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Abstract

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Asymptotic Giant Branch Stars (AGB) are evolved, mass losing red giants with tenuous molecular envelopes which have been the subject of much recent study using infrared and radio interferometers. In oxygen rich stars, radio SiO masers form in the outer regions of the molecular envelopes and are powerful diagnostics of the extent of these envelopes. Spectroscopically resolved infrared interferometry helps constrain the extent of various species in the molecular layer. We made VLBA 7 mm SiO maser, Keck Interferometer near IR and VLTI/MIDI mid IR high resolution observations of the stars U Ari, W Cnc, RX Tau, RT Aql, S Ser and V Mon. This paper presents evidence that the SiO is depleted from the gas phase and speculate that it is frozen onto Al2O3 grains and that radiation pressure on these grains help drive the outflow.

Keywords

masersstars: AGB and post-AGBstars: imagingstars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 245 - 249
Copyright
Copyright © International Astronomical Union 2012

References

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