doubly ionized

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• Doubly ionized oxygen — (also known as [O III]) is a forbidden line of the ion O2+. It is significant in that it emits light in the green part of the spectrum primarily at the wavelength 500.7 nanometres (nm) and secondarily at 495.9 nm. Concentrated levels of [O… …   Wikipedia

• nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …   Universalium

• Sommerfeld-Kossel displacement law — The Sommerfeld Kossel displacement law is: The first spark (singly ionized) spectrum of an element is similar in all details to the arc (neutral) spectrum of the element preceding it in the periodic table. Likewise, the second (doubly ionized)… …   Wikipedia

• star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …   Universalium

• Bowen , Ira Sprague — (1898–1973) American astronomer Bowen, who was born in Seneca Falls, New York State, graduated from Oberlin College, Chicago in 1919 and gained his PhD from the California Institute of Technology, Pasadena in 1926. He taught physics at Cal Tech… …   Scientists

• Cepheid variable — This article is about a class of pulsating stars. For the similarly named constellation, see Cepheus (constellation). Cepheids redirects here. For the fictional species, see Blind Alley . A Cepheid (  /ˈs …   Wikipedia

• 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

• Orion Nebula — The entire Orion Nebula in visible light. Credit: NASA/ESA Observation data: J2000 epoch …   Wikipedia

• Ion notation — In astronomy, ionized atoms are referred to using notation of the form Chemical symbol Roman Numeral. For example, singly ionized Hydrogen is H II. Neutral oxygen would be O I.Forbidden and semiforbidden emission lines are enclosed by one or two… …   Wikipedia

• Bohr model — In atomic physics, the Bohr model created by Niels Bohr depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus mdash;similar in structure to the solar system, but with… …   Wikipedia

• Ring Nebula — For the Ring Nebula in Barnard s Galaxy, see Ring Nebula (NGC 6822). The Ring Nebula M57, The Ring Nebula. Credit: NASA/STScI/AURA …   Wikipedia