nebulium

nebulium
/neuh byooh"lee euhm/, n. Astron.
a hypothetical element once thought to be present in emission nebulae because of certain unidentified spectral lines, now known to be forbidden transitions of oxygen and nitrogen ions.
[1895-1900; NEBUL(A) + -IUM]

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      hypothetical chemical element whose existence was suggested in 1868 by the English astronomer Sir William Huggins as one possible explanation for the presence of unidentified (forbidden) lines (at 3,726, 3,729, 4,959, and 5,007 angstroms wavelength) in the spectra of gaseous nebulae. In 1927 the American physicist and astronomer Ira S. Bowen correctly determined that the common elements oxygen and nitrogen ionized (i.e., electrically charged) under conditions unobtainable on Earth are responsible for these spectral lines. See also forbidden lines.

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Universalium. 2010.

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  • nébulium — ⇒NÉBULIUM, subst. masc. ,,Élément imaginaire auquel on avait cru devoir attribuer deux raies alors inexpliquées du spectre des nébuleuses (MULLER 1980). Le spectre des nébuleuses présente en général les raies de l hydrogène, de l hélium, et d un… …   Encyclopédie Universelle

  • Nebulium — Cat s Eye Nebula (NGC 6543) Nebulium was a proposed element found in a nebula by William Huggins in 1864. The strong green emission lines of the Cat s Eye Nebula, discovered using spectroscopy, led to the postulation that an as yet unknown… …   Wikipedia

  • Nébulium — Nébuleuse de l Œil de chat (NGC 6543) Le nébulium est le nouvel élément chimique postulé en 1864 par William Huggins pour expliquer les raies spectrales inconnues dans le domaine du vert découvertes par l analyse spectrométrique dans la nébuleuse …   Wikipédia en Français

  • Nebulium — Grüne Emissionslinien im Katzenaugennebel (NGC 6543), Hubble Weltraumteleskop 1995 Nebulium (selten Nebulum oder Nephelium) ist der Name für ein im 19. Jahrhundert postuliertes hypothetisches Element. Ihm wurden die grünen Emissionslinien im …   Deutsch Wikipedia

  • Nebulium — nebulis statusas T sritis fizika atitikmenys: angl. nebulium vok. Nebulium, n rus. небулий, m pranc. nébulium, m …   Fizikos terminų žodynas

  • nebulium — nebulis statusas T sritis fizika atitikmenys: angl. nebulium vok. Nebulium, n rus. небулий, m pranc. nébulium, m …   Fizikos terminų žodynas

  • nébulium — nebulis statusas T sritis fizika atitikmenys: angl. nebulium vok. Nebulium, n rus. небулий, m pranc. nébulium, m …   Fizikos terminų žodynas

  • nebulium line — ūkų linija statusas T sritis fizika atitikmenys: angl. nebular line; nebulium line vok. Nebellinie, f rus. небулярная линия, f pranc. raie nébulaire, f …   Fizikos terminų žodynas

  • nebulium — noun A supposed element proposed as a result of spectral analysis of light from a nebula; the emission lines concerned are now known to be due to doubly ionized oxygen …   Wiktionary

  • nebulium — ne·bu·li·um …   English syllables

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