Typical Temperature: ~5,200K to ~7,500KĮxamples of yellow dwarf stars include Alpha Centauri A, Tau Ceti, 51 Pegasi.Because blue stars are so hot and massive, they have relatively short lives that end in violent supernova events, ultimately resulting in the creation of either black holes or neutron stars. Blue stars are also often found in complex multi-star systems, where their evolution is much more difficult to predict due to the phenomenon of mass transfer between stars, as well as the possibility of different stars in the system ending their lives as supernovas at different times.īlue stars are mainly characterized by the strong Helium-II absorption lines in their spectra, and the hydrogen and neutral helium lines in their spectra that are markedly weaker than in B-type stars. Propertiesīlue stars are typically hot, O-type stars that are commonly found in active star-forming regions, particularly in the arms of spiral galaxies, where their light illuminates surrounding dust and gas clouds making these areas typically appear blue. Typical luminosity: ~100 to ~1,000,000 solĮxamples of blue stars include 10 Lacertae, AE Aurigae, Delta Circini, V560 Carinae, Mu Columbae, Sigma Orionis, Theta1 Orionis C, Zeta Ophiuchi.Main sequence stars typically range from between one tenth to 200 times the Sun’s mass. Around 90 percent of the stars in the Universe are main sequence stars, including our sun. Main sequence stars are powered by the fusion of hydrogen (H) into helium (He) in their cores, a process that requires temperatures of more than 10 million Kelvin. The temperature of stars are plotted against their luminosity, and the color of stars (spectral type) against their absolute magnitude. Astronomers can tell a star’s internal structure and evolutionary stage simply by locating its position on the star classification chart. The Hertzsprung-Russell diagram (HR diagram) shows a group of stars at different stages of their evolution. Also, note that stellar luminosities, radii, and masses are given relative to the Sun’s luminosity, radius, and mass. It also provides some quick facts about each type of star, as well as a few details on the physical properties of each class. This list subsequently shows the main star types using the Morgan–Keenan system. For instance, the hottest stars in class A are A0, and then A1, A2, etc all the way to A9, the coolest A type star. The temperature of each spectral class is then further subdivided from hot to cool by the simple addition of a number, where 0 is the hottest and 9 the coolest.
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