Planetary Nebula IC418

These images of the planetary nebula IC 418 reveal a bubble of hot gas surrounding the central white dwarf star. The gas is only observed in the left-hand image because the two images were obtained at different, discrete wavelengths, using the Fabry-Perot Interferometer (FP) with the UFTI camera. The FP was tuned to transmit emission from ionised hydrogen in the left-hand image, then tuned to a 'continuum' wavelength setting, that does not transmit emission from the hot gas in this source.

Credit: Sandy Leggett, Tim Carroll, Chris Davis (JAC)