The offset dependent behavior of narrow optical emission features in the Red Rectangle proto-planetary nebula

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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/N^a
HD 44179		wavelength	coverage	λ/Δλ	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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