Lyman-alpha observations of comets West 1976 VI and P d'Arrest 1976 XI with Copernicus

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Comets, Lyman Alpha Radiation, Oao 3, Ultraviolet Spectra, Emission Spectra, Hydrogen Atoms, Hydrogen Production, Photodissociation, Water Vapor, Comets, Lyman-Alpha Radiation, Observations, West Comet, P/D'Arrest Comet, Copernicus, Spacecraft, Production Rate, Hydrogen, Photodissociation, Kobayashi-Berger-Milon Comet, Formation, Water Vapor, Spectra, Diagrams, Wavelengths, Ultraviolet, Molecular Processes, Data Reduction, Data, Procedure, Calibration, Emissions

Scientific paper

Lyman-alpha observations by the Copernicus satellite have been used to determine the production rates of hydrogen atoms of comets West 1976 VI and P/d'Arrest 1976 XI at a time when they were dynamically active (splitting or outburst of the nucleus). The observed Lyman-alpha line widths are in agreement with those observed in comet Kobayashi-Berger-Milon 1975 IX and, consequently, do not contradict the assumption that the H atoms are produced by the photodissociation of water vapor, even in CO(plus) rich comets..

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