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the central star...
FYI:
I just goolged around for some data on the central star.
well, certainly the central star is solitude, a very hot star of some kKelvin (differing data on that between 15k to 60k)...?
the yellowish "binary-component" to the south is a star far out in the background - it is said to be located some 20k LY behind the nebula.
HST has revealed this to be certain...
so this optical binary system has a distance of some 1.4".
did you know this PN (the faintets of all Messier objects) was long time believed to be a galaxy until precise spectroscopic investigations from the early 19th century revealed its true nature?
the PN is said to be seen from an edge on view - the "barr" or "cork" like brighter part is said to be a kind of ring-like structure - consisting of the material the very hot CS blows out. this brigther part holds approx. 1 arc min in longitud. axis. however the fainter outer parts - the wings of the "butterfly" measure approx. double size.
and further out there are remnants from the periode when the CS dwelled in its "super-giant" phase, commencing to evaporate outer star-mass. it has some diameter of approx. 4-5 arc minutes.
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