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Trigonometric Parallax of the Protoplanetary Nebula OH 231.8+4.2

  • Y. K. Choi (a1), A. Brunthaler (a1), K. M. Menten (a1) and M. J. Reid (a2)

Abstract

We report a trigonometric parallax measurement for the H2O masers around the protoplanetary nebula OH 231.8+4.2 carried out with the Very Long Baseline Array (VLBA). Based on astrometric monitoring for 1 year, we measured a parallax of 0.65 ± 0.01 mas, corresponding to a distance of 1.54 +0.02−0.01 kpc. The spatial distribution of H2O masers is consistent with that found in the previous studies. After removing the average proper motion of 1.4 mas yr−1, corresponding to 10 km s−1, the internal motions of the H2O maser spots indicate a bipolar outflow.

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References

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Desmurs, et al. 2007, A&A, 468, 189
Leal-Ferreira, et al. 2012, A&A, 540, A42
Morris, et al. 1987, ApJ, 321, 888
Reid, et al. 2009, ApJ, 693, 397
Sánchez Contreras, et al. 2004, ApJ, 616, 519
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