raies – -Translation – Keybot Dictionary

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Wolf et Rayet découvrent les étoiles à raies d’émission
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Wolf and Rayet discover emission line stars
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À partir des idées de Jules Janssen, Henry Deslandres va développer la spectroscopie appliquée au Soleil. Il construit en 1892 un instrument capable d’enregistrer photographiquement des images de la chromosphère dans son entier, mais isolées dans quelques raies particulières du spectre.
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Based on ideas originally presented by Janssen, Henry Deslandres developed solar spectroscopy. In 1892, he constructed an instrument which was able to photograph the whole chromosphere, in the light of specific spectral lines. He had thus invented spectro-heliography. This instrument, improved and brought up to date, continues to enrich the solar image data bank, a work which is essential for the analysis of solar activity.