Krełowski, J.J.KrełowskiGalazutdinov, G. A.G. A.GalazutdinovMULAS, GiacomoGiacomoMULASMaszewska, M.M.MaszewskaCECCHI PESTELLINI, CesareCesareCECCHI PESTELLINI2020-06-052020-06-0520150035-8711http://hdl.handle.net/20.500.12386/25934The wavelength displacements of the diffuse interstellar bands (DIBs) 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 two Orion Trapezium stars, HD 37022 and HD 37020, using the HARPS-N spectrograph, attached to the 3.5-m Telescopio Nazionale Galileo, and the Bohyunsan Optical Astronomy Observatory (BOAO) echelle spectrograph (BOES), attached to the 1.8-m Korean telescope. The redshift is ∼25 km s<SUP>-1</SUP> 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.STAMPAenArticle10.1093/mnras/stv11172-s2.0-84942133140000360833700075https://academic.oup.com/mnras/article/451/3/3210/11877852015MNRAS.451.3210KFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_3 Interstellar medium