Planetary nebula distances in Gaia DR2

@article{Kimeswenger2018PlanetaryND,
  title={Planetary nebula distances in Gaia DR2},
  author={Stefan Kimeswenger and Daniela Barr'ia},
  journal={Astronomy \& Astrophysics},
  year={2018}
}
Context. Planetary nebula distance scales often suffer from model-dependent solutions. Model-independent trigonometric parallaxes have been rare. Space-based trigonometric parallaxes are now available for a larger sample using the second Data Release of Gaia. Aims. We aim to derive a high-quality approach for selection criteria of trigonometric parallaxes for planetary nebulae and discuss possible caveats and restrictions in the use of this Data Release. Methods. A few hundred sources from… 

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