subdwarf stars

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• Subdwarf star — A subdwarf star, sometimes denoted by sd , is luminosity class VI under the Yerkes spectral classification system. They are defined as stars with luminosity 1.5 to 2 magnitudes lower than that of main sequence stars of the same spectral type. On… …   Wikipedia

• Subdwarf B star — The subdwarf B star is a kind of subdwarf star with spectral type B. They are from the extreme horizontal branch stars of the Hertzsprung Russell diagram. These stars represent a late stage in the evolution of some stars, caused when a red giant… …   Wikipedia

• Stars named after people — Over the past few centuries, a small number of stars have been named after individual people. It is common in astronomy for objects to be given names, in accordance with accepted astronomical naming conventions. However, most stars are not given… …   Wikipedia

• subdwarf — ˈsəb+ˌ noun Etymology: sub + dwarf : a star having higher surface temperature for its mass and luminosity than is usual to stars of the main sequence and therefore having relatively high density and lying to the left of the main sequence on the… …   Useful english dictionary

• 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

• List of most massive stars — This is a list of the most massive stars so far discovered. The list is ordered by solar mass (1 solar mass = the mass of Earth s Sun). Stellar mass is the most important attribute of a star. Combined with chemical compositions, mass determines a …   Wikipedia

• List of most luminous stars — Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude). Accurate measurement of stellar luminosities is quite difficult in practice, even when the apparent magnitude is measured accurately, for three …   Wikipedia

• List of proper names of stars — This is a list of proper names for stars, mostly derived from Arabic and Latin. See also the list of stars by constellation, which gives variant names, derivations, and magnitudes. Of the roughly 10,000 stars visible to the naked eye, only few… …   Wikipedia

• List of stars with confirmed extrasolar planets — The following are lists of stars with confirmed extrasolar planets. Extrasolar planets were first confirmed to be orbiting pulsars PSR B1257+12 and PSR B1620 26. These discoveries were announced in 1992 and 1993 respectively. The first extrasolar …   Wikipedia

• Mu Cassiopeiae — A/B Star map of Cassiopeia. Mu Cassiopeiae is circled …   Wikipedia

• Astronomical object — Celestial object and Celestial body redirect here. For other uses, see Celestial (disambiguation). This article is about naturally occurring objects. For artificial objects, see Satellite. Astronomical objects or celestial objects are naturally… …   Wikipedia