Interstellar carbon monoxide in the direction of the supernova remnant S147

Astronomy and Astrophysics – Astronomy

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Absorption Spectra, Carbon Monoxide, Interstellar Gas, Stellar Spectra, Supernova Remnants, Electron Transitions, Spectral Line Width, Ultraviolet Spectra

Scientific paper

The paper examines interstellar carbon monoxide in the direction of the supernova remnant S147. The electronic bands in the fourth positive system of (C-12)(O-16) were detected in absorption in the ultraviolet spectrum of the Ble star HD 36665. The line of sight to this star is 1 deg away from the center of the supernova remnant S147 and the star lies behind the remnant. The equivalent widths of seven bands of a transition of (C-12)(O-16) were measured and a satisfactory fit to a curve of growth can be obtained for a velocity dispersion b = 5.5 plus or minus 0.5 km/sec; the bands of (C-13)(O-16) have also been detected in the spectrum of HD 36665.

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