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Trigonometric parallax of the protoplanetary nebula OH 231.8+4.2

Published online by Cambridge University Press:  30 August 2012

Yoon Kyung Choi ,
Andreas Brunthaler ,
Karl M. Menten  and
Mark J. Reid
Yoon Kyung Choi*
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Andreas Brunthaler
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Karl M. Menten
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Mark J. Reid
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
*
*email: ykchoi@mpifr-bonn.mpg.de
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Abstract

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We report trigonometric parallx measurements for H2O masers around the protoplanetary nebula OH 231.8+4.2 carried out with the Very Long Baseline Array. Based on astrometric monitoring for 1 year, we measured a trigonometric parallax of 0.89 ± 0.04 mas, corresponding to a distance of 1.12+0.05 −0.05 kpc. This is the most accurate distance to OH 231.8+4.2, and the first one based on an annual parallax measurement. The distribution and internal motions of the H2O masers are consistent with the bipolar outflow suggested in literatures.

Keywords

astrometrystars: late-typestars: distancesstars: individual (OH 231.8+4.2)

References

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