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Star | Definition, Light, Names, Facts | Britannica This article describes the properties and evolution of individual stars Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of stars
Star - Mass, Luminosity, Age | Britannica Star - Mass, Luminosity, Age: Temperatures of stars can be defined in a number of ways From the character of the spectrum and the various degrees of ionization and excitation found from its analysis, an ionization or excitation temperature can be determined
Star - Spectra, Classification, Evolution | Britannica The star studied most extensively is, of course, the Sun, but many others also have been investigated in detail The general characteristics of the spectra of stars depend more on temperature variations among the stars than on their chemical differences
Neutron star | Definition, Size, Density, Temperature, Facts - Britannica Neutron star, any of a class of extremely dense, compact stars thought to be composed primarily of neutrons Neutron stars are typically about 20 km (12 miles) in diameter Their masses range between 1 18 and 1 97 times that of the Sun, but most are 1 35 times that of the Sun
Hertzsprung-Russell diagram | Definition Facts | Britannica Stars of a few solar masses eject their outer layers as planetary nebulae, which have a hot, luminous central star found in the upper left of the diagram Stars like the Sun burn down to cool white dwarfs, which are found in the bottom left of the diagram
White dwarf star | Definition, Size, Mass, Life Cycles, Facts . . . White dwarf star, any of a class of faint stars representing the endpoint of the evolution of intermediate- and low-mass stars White dwarf stars are characterized by a low luminosity, a mass on the order of that of the Sun, and a radius comparable to that of Earth
Star - Spectral Types, Classification, Astronomy | Britannica The Henry Draper Catalogue and the Bright Star Catalogue list spectral types from the hottest to the coolest stars (see stellar classification) These types are designated, in order of decreasing temperature, by the letters O, B, A, F, G, K, and M
Star - Fusion, Mass, Energy | Britannica Star - Fusion, Mass, Energy: To interpret a stellar spectrum quantitatively, knowledge of the variation in temperature and density with depth in the star’s atmosphere is needed
Stellar classification | Types, Spectral Classes Luminosity - Britannica The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard system, which is based on the star’s surface temperature, and the MK system, which is based on the star’s luminosity