Sorry for the delayed reply.

To answer Glenc question, the Y-shape is probably only able to be seen in smaller scope in the order of 20cm, which my observing notes describe. This is orientated by 135 degrees from north, with the bottom point of the Y facing upwards at the top of the field.

This is probably because the butterfly shape (as described by astroron) is visible in large apertures.

As for the OIII, your are probably right. I though this brightened the nebulosity in 20cm very close to the central star / progenitor - agreeing with the article's statement. This actuality is given in the literature during the 1970's as well, which some have assumed was direct evidence of a close blue star causing the inner nebulosity to shine not by reflecting light but by acttual llumination by flouresence. As the star is variable, you could assume the nebulosity closeby is also changing in brightness - though several papers comment that this has not ever been observed.

Perhaps we are missing something not noted here???