Publication Date:
2015-06-24
Description:
The 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 –1 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.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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