Redshifted diffuse interstellar bands in the Orion OB1 association
Date Issued
2015
Author(s)
Abstract
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.
Volume
451
Issue
3
Start page
3210
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.451.3210K
Rights
open.access
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