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Table 1

NTT-EMMI telescope settings for spectra taken at the central star and at 3, 7, 16 and 20′′ offset from the central star.

Distance to Grating Central Wavelength Resolution Integration S/Na
HD 44179 wavelength coverage λλ time in 1-dimensional spectrum
(′′) (Å) (Å) (s)

0 6 5870 640 5000 60 229
0 6 6500 640 5000 60 268
3 6 5870 640 5000 500 207
3 6 6500 640 5000 500 149
7 6 5870 640 5000 2000 64
7 6 6500 640 5000 2000 69
16 7 6200 1300 2600 3600 34
20 7 6200 1300 2600 3600 31

Notes. The slit orientation is 105° east from north, perpendicular to the nebula’s symmetry axis.

(a)

The signal-to-noise (S/N) was determined on a small portion of the spectrum avoiding emission and absorption lines.

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