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Expansion parallaxes and intrinsic stellar properties for 15 simple planetary nebulae

Published online by Cambridge University Press:  08 August 2017

Detlef Schönberner ,
Ralf Jacob  and
Bruce Balick
Detlef Schönberner
Affiliation:
Leibniz-Institut für Astrophysik (AIP), 14482 Potsdam, Germany email: [email protected]
Ralf Jacob
Affiliation:
Leibniz-Institut für Astrophysik (AIP), 14482 Potsdam, Germany email: [email protected]
Bruce Balick
Affiliation:
Astronomy Department University Washington, Seattle, WA 98195, USA email: [email protected]
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Abstract

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We determined individual distances to a small number of rather round, quite regularly shaped planetary nebulae by combining their angular expansion in the plane of the sky with a spectroscopically measured expansion along the line of sight. For this goal, we combined up to three epochs of Hubble Space Telescope imaging data and determined the respective proper motions of rim and shell edges, and of other features as well. Ground-based radial velocities are assigned separately to the nebular rims and shells and used to determine individual distances, thereby assuming that the expansions in the line-of-sight and in the plane of sky are equal. We employed 1D radiation-hydrodynamics simulations of planetary nebulae evolution to correct for the difference between the spectroscopically measured expansion velocities of rim and shell and the expansion speeds of their respective shock fronts.

Keywords

planetary nebulaetechniques: image processingtechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S323: Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution , October 2016 , pp. 354 - 356
Copyright
Copyright © International Astronomical Union 2017 

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