The wavelength displacement of the Diffuse Interstellar Bands at 4502 , 5705 , 5780 , 6284 , and 7224 Å with respect to the well known , narrow atomic/molecular interstellar lines ( of Ca ii and Na i ) have been measured in the spectra of the 2 Orion Trapezium stars HD 37022 and HD 37020 , using the HARPS–N spectrograph , fed with the 3.5 m Telescopio Nazionale Galileo , and the BOES spectrograph , fed with the 1.8m Korean telescope .
The red–shift is \sim 25 km/s for all these DIBs .
We discuss the various possible origins of this very peculiar wavelength shift in the light of the particular physical conditions in the Orion Trapezium .
The above mentioned shift is seemingly absent in the DIBs at 6196 and 6993 Å .