Correlations between diffuse interstellar bands and atomic lines

Details Correlations between diffuse interstellar bands and atomic lines Correlations between diffuse interstellar bands and atomic lines

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.355..169g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 355, Issue 1, pp. 169-177.

Astronomy and Astrophysics

Astronomy

11

Ism: Clouds, Ism: Lines And Bands

Scientific paper

We present and discuss correlations between strengths of the well-known, strong interstellar atomic lines of KI and CaII, and four selected, strong unidentified diffuse interstellar bands (DIBs): 5780, 5797, 5850 and 6614. In order to analyse a homogeneous sample of echelle high-resolution spectra it has been chosen to use measurements from Terskol Observatory in Northern Caucasus plus a selected number of higher resolution observations performed using other instruments. We demonstrate that the strength of certain DIBs correlate well with neutral potassium lines and to a much lower degree with ionized calcium lines. This fact suggests that the degree of irradiation of a cloud with UV photons, capable to ionize interstellar atoms, plays a crucial role in the formation/maintenance of certain molecular species: possible carriers of DIBs.

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