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Image of the planetary nebula Sharpless 2-200. This is a very evolved planetary nebula, whose central star has already faded to a low luminosity after exhausting all circumnuclear fuel. Around the filamentary inner nebula, a large faint halo is observed. This halo might be interstellar gas ionized by the central star of the planetary nebula, or alternatively ancient material ejected by the star itself when it was a red giant some 50 to 100 thousand years ago. These haloes provide very precious information about the various events of strong mass loss at the end of life of solar type stars. These mass loss events are the ultimate cause leading to the death of these stars. Image obtained using the Wide Field Camera at the 2.5m INT telescope. A narrow filter has been used to isolate the emission from the nebular gas in the hydrogen Halpha line (at wavelength 656 nm) and in the nitrogen doublet [NII] at lambda 655 and 658 nm.
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