helium rich stars

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• Helium hydride ion — The hydrohelium(1+) cation, HHe+, is a positively charged ion formed by the reaction of a proton with a helium atom in the gas phase, first observed in 1925. [cite journal | author = T. R. Hogness and E. G. Lunn | title = The Ionization of… …   Wikipedia

• White dwarf — For other uses, see White dwarf (disambiguation). Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A …   Wikipedia

• Naine blanche —  Ne pas confondre avec Étoile blanche de la séquence principale Sirius B est une naine blanche visible comme un petit point en bas à gauche de …   Wikipédia en Français

• Naine Blanche — Traduction terminée White dwarf → …   Wikipédia en Français

• Naines blanches — Naine blanche Traduction terminée White dwarf → …   Wikipédia en Français

• Enana blanca — Saltar a navegación, búsqueda Comparación de tamaños entre la enana blanca IK P …   Wikipedia Español

• Sigma Orionis — Starbox begin name=Sigma Orionis A/B/C/D/EStarbox observe epoch=J2000 constell=Orion ra=05h 38m 44.80s dec=−2° 36 00.0 appmag v=4.2/5.1/8.79/6.62/6.66 Starbox character class=O9V/B0.5V/A2V/B2V/B2Vp b v=?/?/−0.02/−0.20/−0.18 u b=?/?/−0.25/−0.87/−0 …   Wikipedia

• cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

• Stellar classification — In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are… …   Wikipedia

• Star — For other uses, see Star (disambiguation) …   Wikipedia

• Metallicity — The globular cluster M80. Stars in globular clusters are mainly older metal poor members of Population II. In astronomy and physical cosmology, the metallicity (also called Z[1]) of an object is the proportion of its matter made …   Wikipedia