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Table 4

Parameters of the UV bump at 4.6 μm-1 (217.5 nm) in the spectra of irradiated HAC materials in comparison with those of the astronomical data.

FWHM ΔFWHM NC/NHa
 μm-1  μm-1  μm-1  μm-1 ppm

S4irr.(33%D) 4.595 1.04 –0.001 0.05 164
S7irr.(33%D) 4.607 1.041 0.011 0.051 269
S8irr.(21%D) 4.69 1.15 0.094 0.16 236
S21irr.(21%D) 4.639 1.12 0.043 0.13 108
S23irr.(33%D) 4.608 1.11 0.012 0.12 115
DISM 4.596 0.99 0.0 0.0 ....
average FM07 4.592 0.922 –0.045 –0.03 ....
HD698 4.551 0.96 0.04 –0.05 ....
HD3191 4.636 0.94 –0.018 0.08 ....
NGC457 P. 9 4.578 1.07 –0.019 0.12 ....
Cr463-5 4.61 1.08 0.014 0.09 ....

Notes.

(a)

The last column gives the required carbon abundance to match the band strength in diffuse ISM.

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