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Investigation into broad interstellar absorption lines

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Diffuse interstellar bands (DIBs) are investigated mainly with high-resolution spectroscopy, which allows very fine structures to be detected. However, the rapidly increasing resolution of echelle spectra becomes a disadvantage when broad absorption structures are involved. These can extend over several dozen angstroms, taking up a significant part of a single echelle order and thus posing an impediment to a proper continuum tracing. This is where low-resolution spectroscopy can regain its importance in DIB research. Recently, an attempt has been made to connect the broader DIBs with polycyclic aromatic hydrocarbons, and more specifically with the naphthalene cation. We present spectra obtained with a spectrograph obtaining information from the 90 cm Torun telescope, accompanied by high-resolution observations made at the Terskol Observatory.

Keywords: Interstellar absorption lines; Observations

Document Type: Research Article


Publication date: December 1, 2003

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