The relation between 5780 and 5797 diffuse interstellar bands, CH/CH + molecules, and atomic or molecular hydrogen
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In this article, column densities of CH and CH+ molecules were used to analyze correlations between abundances of CH/CH+ molecules and strengths of the major 5780 and 5797 DIBs.Abstract:
Correlations between column densities of neutral and molecular hydrogen and strengths of major 5780 and 5797 Å diffuse interstellar bands (DIBs) based on spectra of 66 OB stars were analyzed. We confirm that the 5797 Å DIB is more tightly correlated with column density of molecular hydrogen while the 5780 DIB – with that of atomic hydrogen. This leads to a reasonably tight relation between the molecular fraction of H2 and equivalent width ratio of the 5797 and 5780 major diffuse bands with correlation coefficient equal to 0.77 ± 0.05. Column densities of CH and CH+ molecules were used to analyze correlations between abundances of CH/CH+ molecules and strengths of the major 5780 and 5797 DIBs. The 5780 DIB is better correlated with the column density of methydyline cation than the 5797 DIB. A relation with correlation coefficient equal to 0.95 ± 0.02 based on precise column densities, between column densities of CH and H2 molecules, is also presented; in other words, the column densitiy ratio in the case of H2 and CH molecules in the ISM is equal to (2.01 ± 0.09) × 107 .read more
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Journal ArticleDOI
Studies of the Diffuse Interstellar Bands. III. HD 183143
L. M. Hobbs,Donald G. York,Julie A. Thorburn,Julie A. Thorburn,Theodore P. Snow,Michael Bishof,Scott D. Friedman,Benjamin J. McCall,Takeshi Oka,Brian L. Rachford,Paule Sonnentrucker,Daniel E. Welty +11 more
TL;DR: In this article, a catalog of 414 diffuse interstellar bands (DIBs) measured between 3900 and 8100 A in the Echelle spectra of HD 183143 [B7Iae, E(B-V) = 1.27] were obtained on three nights, at a resolving power R = 38,000 and with a signal-to-noise ratio ~1000 at 6400 A.
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Fingerprinting the effects of hyperfine structure on CH and OH far infrared spectra using Wiener filter deconvolution
Arshia M. Jacob,Karl M. Menten,Helmut Wiesemeyer,Min-Young Lee,Min-Young Lee,Rolf Güsten,C. Duran +6 more
TL;DR: In this article, the influence of hyperfine splitting on complex spectral lines was investigated with the aim of evaluating canonical abundances by decomposing their dependence on hyperfine structures, which is achieved from first principles through deconvolution.
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Are the carriers of diffuse interstellar bands and extended red emission the same
TL;DR: In this article, the authors reported the first spectroscopic observations of a background star seen through the region between the ionization front and the dissociation front of the nebula IC 63.
Journal ArticleDOI
Fingerprinting the effects of hyperfine structure on CH and OH far infrared spectra using Wiener filter deconvolution
Arshia M. Jacob,Karl M. Menten,Helmut Wiesemeyer,Min-Young Lee,Min-Young Lee,Rolf Güsten,C. Duran +6 more
TL;DR: In this paper, the authors investigated the influence of hyperfine splitting on complex spectral lines, with the aim of evaluating canonical abundances by decomposing their dependence on hyperfine structures, achieved from first principles through deconvolution.
Journal ArticleDOI
The excitation temperature of the CH 3335-MHz line
TL;DR: In this article, the authors used the 3.3 GHz line as a proxy for H2 and obtained a wide range of excitation temperatures for nine lines of sight, including some with |Tex| < 5 K.
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