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1
Content available remote Relation between NH and other Simple Molecules
Weselak T.
Acta Astronomica
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2023
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Vol. 73, No. 3
233--242
EN
Relations between abundances of interstellar NH molecule and other diatomic species as OH, CH, CH+ and molecular/atomic hydrogen are presented based on 16 available sight-lines. Spacial correlations between column densities of diatomic molecules suggest that the NH molecule is rather related to interstellar CN (correlation coefficient equal to 0.82±0.09). A good relation with molecular hydrogen with correlation coefficient equal to 0.79±0.12 is also presented.
2
Content available remote On the Relation between OH and CH Radicals, Molecular/Neutral Hydrogen and Major 5780/5797 Diffuse Interstellar Bands
Weselak T.
Acta Astronomica
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2022
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Vol. 72, No. 3
233--243
EN
A precise relation between column densities of OH and CH molecule in the ISM has been found based on spectra of 24 stars (four of them new) and new published oscillator strengths of lines near 3078 Å and 30828 Å of OH molecule (0.001007 and 0.0006226, respectively). Observed column density ratio of OH and CH molecules in the ISM is equal to 3.20±0.17. A very good relation (with correlation coefficient equal to 0.85) between abundances of OH molecule and molecular hydrogen is also presented.
3
Content available remote On the Relation between OH+, OH and CH+ Molecules, Neutral/Molecular Hydrogen and Major 5780/5797 DIBs
Weselak T.
Acta Astronomica
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2020
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Vol. 70, No. 4
301--312
EN
Relations between column densities of OH+, OH+ and CH+ molecules and between atomic and molecular hydrogen and intensities of major 5780 Å and 5797 Å diffuse interstellar bands are examined based on spectra of 46 stars. Data on OH+, OH, CH+ and atomic/molecular hydrogen were taken from the literature. Data on 5780 Å and 5797 Å DIBs are based mostly on our own measurements. Column densities of the OH+ are very well correlated with abundances of OH molecule and not correlated with CH+ and hydrogen in any form. Column densities of OH+ are better correlated with narrow 5797 Å than 5780 Å major DIB. The value of abundance ratio in the case of OH and OH+ molecules in the ISM is equal to 5.73±0.45.
4
Content available remote Diffuse Interstellar Bands and Temperatures in the Interstellar Clouds
Gnaciński P., Weselak T., Krełowski J.
Acta Astronomica
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2016
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Vol. 66, No. 1
121--130
EN
The diffuse interstellar bands (DIBs) observed in the optical and infrared spectrum of interstellar clouds remain the oldest unsolved problem in spectroscopy. We have analyzed correlations between normalized DIBs equivalent widths (EW's) and temperatures of interstellar H2 and CN molecules. The λ6284 Å DIB is well correlated with T temperature of H2. The correlation may be caused by DIB profile broadening or more effective production of DIB carrier at higher temperatures. The DIBs: λ4964 Å, λ5797 Å and λ6614 Å are anti-correlated with T temperature of H2. The anti-correlation may be attributed to destruction of DIBs carriers in high-UV radiation fields.
5
Content available remote Consistent System of Oscillator Strengths of A2Δ-X2Π (0,0) and B2Σ--X2Π (0,0) Bands of CH Molecule
Weselak T., Galazutdinov G. A., Gnaciński P., Krełowski J.
Acta Astronomica
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2014
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Vol. 64, No. 3
277--292
EN
Detailed analysis of intensity ratios of unsaturated methylidyne (CH) A-X and B-X bands suggests consistency of the recently published oscillator strengths of A2Δ-X2Π (0,0) - 4300 Å and B2Σ- - X2Π (0,0) - (3878 Å, 3886 Å and 3890 Å) bands (i.e. 506, 107, 320 and 213×10-5 respectively). This result is based on extremely high S/N ratio spectra of 45 stars, acquired with three high-resolution spectrographs, situated in Chile: ESO La Silla (HARPS), ESO Paranal (UVES) and Las Campanas (MIKE) and MAESTRO instrument situated in Northern Caucasus (Russia). The calculated methylidyne column densities, obtained using the consistent system of the oscillator strengths toward the observed targets, are given as well. We verify oscillator strengths of the CH+ A-X (0,0) and (0,1) bands at 4232 Å and 3957 Å equal to 545 and 342×10-5 respectively. We also confirm the lack of correlation between abundances of neutral CH and CH+ which demonstrates that they are originated in different environments.
6
Content available remote Carriers of 4964 and 6196 Diffuse Interstellar Bands and Environments Dominated by either CH or CH+ Molecules
Weselak T., Galazutdinov G. A., Sergeev O., Godunova V., Kołos R., Krełowski J.
Acta Astronomica
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2014
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Vol. 64, No. 4
371--382
EN
The analysis of radial velocities of interstellar spectral features: CH, CH+ as well as 4964 and 6196 diffuse interstellar bands, seen in spectra of HD 151932 and HD 152233, suggests that carrier of the former is spatially correlated with CH while that of the latter - with CH+. A further analysis, done in this paper and based on the sample of 106 reddened OB stars, partly confirms this suggestion, showing that the CH column density correlates indeed much better with the equivalent width of the 4964 DIB than with that of the 6196 DIB. However, the strengths of the 6196 DIB correlate only marginally better with CH+ than with CH.
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