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VLBA H2O and SiO maser observations in the pPN OH 231.8+4.2

Published online by Cambridge University Press:  01 March 2007

J.-F. Desmurs ,
C. Sánchez Contreras ,
V. Bujarrabal ,
J. Alcolea  and
F. Colomer
J.-F. Desmurs
Affiliation:
Observatorio Astronómico Nacional, Madrid, Spain email: desmurs@oan.es
C. Sánchez Contreras
Affiliation:
Departamento de Astrofísica Molecular e infrarroja, Instituto de Estructura de la Materia, CSIC, Madrid, Spain
V. Bujarrabal
Affiliation:
Observatorio Astronómico Nacional, Alcalá de Henares, Spain
J. Alcolea
Affiliation:
Observatorio Astronómico Nacional, Madrid, Spain email: desmurs@oan.es
F. Colomer
Affiliation:
Observatorio Astronómico Nacional, Alcalá de Henares, Spain
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Abstract

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We report high-resolution observations of H2O, 61,6−52,3 and 28SiO v=2, J=1-0 maser emissions obtained with the Very Long Baseline Array in the bipolar pre-planetary nebulae OH 231.8+4.2 (see Desmurs et al., 2007). A phase referencing technique was used to recover the absolute position of both emissions. We detected two groups of water vapour emission oriented nearly north-south. SiO masers are tentatively found to be placed between the two H2O maser emitting regions.

Keywords

Maserstars: AGB and post-AGBradio lines: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 338 - 339
Copyright
Copyright © International Astronomical Union 2008

References

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