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

  • J.-F. Desmurs (a1), C. Sánchez Contreras (a2), V. Bujarrabal (a3), J. Alcolea (a1) and F. Colomer (a3)...

Abstract

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.

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References

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Colomer, F., Reid, M. J., Menten, K. M., & Bujarrabal, V. 2000, A&A 355, 979
Desmurs, J.-F., Bujarrabal, V., Colomer, F., & Alcolea, J. 2000, A&A 360, 189
Desmurs, J.-F., Alcolea, J., Bujarrabal, V., Sánchez Contreras, C., & J. Colomer, F. 2007, A&A in press
Loup, C., Forveille, T., Omont, A., & Paul, J. F. 1993, A&AS 99, 291
Sánchez Contreras, C., Desmurs, J.-F., Bujarrabal, V., Colomer, F., & Alcolea, J. 2002, ApJ 385, L1
Sánchez Contreras, C., Gil de Paz, A., & Sahai, R. 2004, ApJ 616, 519
Shure, M., Sellgren, K., Jones, T. J., & Klebe, D. 1995, AJ 109, 721
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