Semiregular variable star — Semiregular variable stars are giants or supergiants of intermediate and late spectral type showing considerable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20… … Wikipedia
Orion variable — An Orion variable is a variable star which exhibits irregular and eruptive variations in its luminosity and is typically associated with diffuse nebulae. It is thought that these are young stars which will later become regular, non variable stars … Wikipedia
Estrella variable RS Canum Venaticorum — Las estrellas variables RS Canum Venaticorum o estrellas RS CVn son un tipo de variables eruptivas compuestas por un estrella binaria cuyas componentes, de tipo espectral F, G o K, tienen intensa actividad cromosférica. Ambas estrellas están muy… … Wikipedia Español
Be star — A Be star is a B type star with prominent emission lines of hydrogen in its spectrum. The designation is combined by the spectral class, B , and the lowercase e denoting emission in the spectral classification system. Line emission from other… … Wikipedia
Achernar — Posición de Achernar. Datos de observación (Época J2000) Constelación Eridanus … Wikipedia Español
Achernar — Starbox begin name=Achernar Starbox image caption=The position of Achernar. Starbox observe epoch=J2000 constell=Eridanus ra=01h 37m 42.8s dec=−57° 14 12 appmag v=0.50 Starbox character class=B3 Vpe b v=−0.20 u b=−0.66 variable=Lambda Eridani… … Wikipedia
Stars and planetary systems in fiction — The planetary systems of stars other than the Sun and the Solar System are a staple element in much science fiction. Contents 1 Overview 1.1 The brightest stars … 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
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
List of nearest stars — Artist s conception of a red dwarf star, the most common type of star in the Sun s stellar neighborhood, and in the universe. Although termed a red dwarf, the surface temperature of this star would give it an orange hue when viewed from close… … Wikipedia