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Fig. 8


Hβ line is shown for the spectrum taken in 2010 and for the spectrum taken in 2012, position 2. The identified emission lines are labeled for better comparison. Pixel 00 (2010) corresponds to the south-east position. Pixel 00 for position 2 in 2012 is located in the east. Both spectra show clearly the P Cygni line profile of the Hβ line. Again, there is no difference in the individual line profiles for the different pixel spectra, and/or slit positions. There is also no change in relative intensity among the detected emission features. A clear decrease in intensity is detected with distance to the central star. The bottom-most panel gives the residuals of the slit spectrum in 2012 (position 2) when the spectrum at +0.6′′ (pixel 30) is subtracted from the spectrum at 2.5′′ (pixel 15) distance to the central star. Negative distances indicate directions in the south-(east) of the nebula. Positive distances indicate directions towards the north-(west).

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