Expansion parallax of the planetary nebula IC 418

Abstract

In this paper, we present radio continuum observations of the planetary nebula IC 418 obtained at two epochs separated by more than 20 years. These data allow us to show that the angular expansion rate of the ionization front in IC 418 is 5.8 $\pm$ 1.5 mas yr${}^{-1}$. If the expansion velocity of the ionization front is equal to the expansion velocity of the gas along the line of sight as measured by optical spectroscopy, then the distance to IC 418 must be 1.1 $\pm$ 0.3 kpc. Recent theoretical predictions appropriate for the case of IC 418, however, suggest that the ionization front may be expanding about 20% faster than the material. Under this assumption, the distance to IC 418 would increase to 1.3 $\pm$ 0.4 kpc.

Accepted in the Astronomical Journal

References in corpus (2)

• The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale
• Trigonometric Parallaxes of Central Stars of Planetary Nebulae

Cited by in corpus (16)

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• The Expansion Proper Motions of the Planetary Nebula NGC 6302 from HST imaging
• IFU spectroscopy of Southern Planetary Nebulae IV: A Physical Model for IC 418
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• Discovery of Multiple Shells Around the Planetary Nebula IC 418
• The Oxygen Abundance in the Solar Neighborhood
• Confronting expansion distances of planetary nebulae with Gaia DR2 measurements
• First Detection of ${}^3$He${}^{+}$ in the Planetary Nebula IC418
• SMC SMP 24: A newly radio-detected planetary nebula in the small magellanic cloud
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• 3He: Does the problem persists?
• Deep survey of millimeter RRLs towards the planetary nebulae IC 418 and NGC 7027
• The secular evolution of planetary nebula IC 418 and its implications for carbon star formation