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

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Table 3

Summary of narrow emission features superimposed on the ERE and compared to known DIBs.

Band position	Closest detection^a	Furthest detection^a	Profile^b	Width^c	Δ FWHM	bandshifts	Intensity	DIB position^d	FWHM ^d
(Å)	[′′]	[′′]			7–14 ′′	7–14 ′′	[%]	[Å]	[Å]

5651	6 (+)	14 (+)	as	n	stable	blueshift	3.4	5652.22	1.3
5767	6 (+)	14 (+)	rd	n	narrowing	blueshift	2.3	5766.98	4.50
5800	3 (+)	20 (+)	rd	n	narrowing	blueshift	2.2	5797.20	0.91
5826	3 (+)	20 (+)	s	b	narrowing	blueshift	1.7	5818.81	0.65
5852	3 (+)	20 (+)	rd	n	narrowing	blueshift	1.7	5849.88	0.93
5881	6 (+)	20 (?)	s	n	narrowing	blueshift	1.7	–	–
NaI D₂	central star	20 (+)	s	n	not resolved	stable	not resolved	–	–
NaI D₁	central star	20 (+)	s	n	not resolved	stable	not resolved	–	–
5913	6 (+)	20 (?)	broad wings	broad wings	stable	blueshift	1.9	5910.61	0.73
6108	6 (+)	14 (+)	s	b	stable	blueshift	1.5	6108.19	0.6
6162	6 (+)	20 (?)	s	n	stable	blueshift	3.0	6159.80	1.17
6220	7 (+)	20 (?)	s	n	stable	blueshift	7.6	6221.02	0.88
6379	7 (+)	20 (+)	broad wings	broad wings	narrowing	blueshift	3.6	6376.21	0.94
6399	7 (+)	20 (+)	s	n	narrowing	blueshift	2.2	6396.88	1.03
6553	7 (+)	20 (+)	s	n	broadening	blueshift	7.2	6553.95	0.57
Hα	central star	20 (+)	s	n	stable	stable	1.2	–	–
6615	7 (+)	20 (+)	rd	n	narrowing	blueshift	3.7	6613.70	1.08

Notes.

^(a)

(+) indicates unambiguous detections, (?) indicates likely detections.

^(b)

s = symmetric, as = asymmetric, rd = red degraded profile showing a steep blue edge.

^(c)

Column 5 gives an indication whether a band is n = narrow or b = broad.

^(d)

(Hobbs et al. 2009).

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