Extended correlations between diffuse interstellar bands

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Volume 690 (October 2024)

A&A, 690 (2024) A275

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Table D.4

Possible DIB vibronic system of the major DIB λ6613 (ζσ)

Mode	${D I B}_{v}^{m}$ $\[\mathrm{DIB}_{\text{v}}^m\]$ Å	σ cm⁻¹	$σ_{t h}^{a}$ $\[\sigma_{\mathrm{th}}^a\]$ cm⁻¹	$q_{6613}^{b}$ $\[\mathrm{q}_{6613}^b\]$	EW^c mÅ	FW^d Å	$R_{21}^{e}$ $\[\mathrm{R}_{21}^e\]$	T^f
$0_{0}^{0}$ $\[0_0^0\]$	6613	0	0	x	318	1.1	0.52	ζσ
$V_{0}^{1}$ $\[\mathrm{V}_0^1\]$	6520^l	216	x	0.97	48	1.0	0.54	ζσ
$V_{0}^{2}$ $\[\mathrm{V}_0^2\]$	6425	442	432	0.91	21	0.7	0.70
	6445?^j	395?	432	0.93	40	0.6	0.77	ζσ
$V_{0}^{3}$ $\[\mathrm{V}_0^3\]$	6330	678	658	0.93	16	0.7	0.63	ζσ
$V_{0}^{4}$ $\[\mathrm{V}_0^4\]$	6245	892	845	0.95	7.2	0.5	0.60
$W_{0}^{1}$ $\[\mathrm{W}_0^1\]$	6494^g	278	x	0.87^g	266	7.4	0.28^g
	6498	269	x	0.93	9.4	0.7	0.47
$W_{0}^{2}$ $\[\mathrm{W}_0^2\]$	6376	553	556	0.95	50	0.8	0.73	ζσ
	6377?^j	561	556	0.90	15	0.6	1.1?	ζσ
	6367?^j	585?	556	0.97	18	0.9	0.89	ζσ
$W_{0}^{3}$ $\[\mathrm{W}_0^3\]$	6270^h	829	834	0.97	134	1.2	0.41	σ^h
	6271	825	834	0.91	30	0.5	0.33
$W_{0}^{4}$ $\[\mathrm{W}_0^4\]$	6159	1115	1112	0.94	11	1.0	0.41
$V_{0}^{1} W_{0}^{1}$ $\[\mathrm{V}_0^1 \mathrm{W}_0^1\]$	6397	512	494	0.91	39	1.3	0.51	ζσ
$V_{0}^{2} W_{0}^{1}$ $\[\mathrm{V}_0^2 \mathrm{W}_0^1\]$	6318	707	720	0.90	147	4.8	0.33
$V_{0}^{4} W_{0}^{1}$ $\[\mathrm{V}_0^4 \mathrm{W}_0^1\]$	6498	1089	1072	0.93	9.4	0.7	0.47
$V_{0}^{1} W_{0}^{3}$ $\[\mathrm{V}_0^1 \mathrm{W}_0^3\]$	6185	1046	1045	0.94	12	0.5	0.58	ζσ
$W_{0}^{1} W_{0}^{3}$ $\[\mathrm{W}_0^1 \mathrm{W}_0^3\]$	6159	1114	1107	0.94	11	1.0	0.41
$V_{0}^{2} W_{0}^{3}$ $\[\mathrm{V}_0^2 \mathrm{W}_0^3\]$	6113^k	1258	1260	0.96	33	0.7	0.79
	6108^k	1252	1260	0.93	14	0.5	0.57	ζσ
$V_{0}^{1} W_{0}^{2}$ $\[\mathrm{V}_0^1 \mathrm{W}_0^2\]$	6384?ⁱ	793	790	0.88ⁱ	1958	4.5	0.29	σⁱ

m Expected vibronic DIBs, with origin at 6613 Å, and possible vibration modes V at 216 cm⁻¹ and W at 278 cm⁻¹, inferred from λ6520^l and λ6494^g, respectively.

a Expected wave number of the vibronic DIB.

b Regular Pearson correlation coefficient with λ6613.

c Equivalent width in HD 183143 sight line, measured by APO or inferred.

d APO DIB width (FWHM).

e Ratio of equivalent widths in HD 204827 to HD 183143, measured by APO or inferred.

f DIB family type of DIBv, from Fan et al. (2022). Transition DIBs between the ζ and σ families are denoted ζσ.

g Very broad DIB, possibly implying uncertain values for q₆₆₁₃ and R₂₁.

h Major DIB, λ6269.66, classified as σ by Fan et al. (2022), close to the limit of ζσ DIBs in their Fig. B2.

i An additional DIB at about 6285 Å might be hidden within the very strong and broad DIB λ6284.

j Tentative identification, that may be wrong because of poor wave-number match, low correlation or poor R₂₁ fit.

k λ6108 and λ6113 might also be part of the vibronic system of λ6196 (Table D.3).

l The profiles of the main DIB, λ6613, and the possible vibronic DIB, λ6520, are reported as highly correlated by Ebenbichler et al. (2024).

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