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is the main sequence on the HR diagram on the left "ielwjefljll",Tiffany Jewelry Sale, (high temperature, high luminosity) to the lower right (low temperature, low light) most of the star cluster of the sequence, the star is located at the heart of its hydrogen fusion stage.

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Introduction to the concept of the main sequence features associated with sequence Xingzhu brief

HR diagram

main sequence (main sequence) stars in astronomy is the youth and . At this stage the star of the total life time spent more than 90??. This is a relatively stable phase of outward expansion and inward contraction of the two forces roughly balance, not expansion of the star is basically no shrinkage. In the main sequence stars known as main sequence stars, now the sun is a main sequence star. Now at the age of the sun 4.6 billion years, it's the main sequence is over half the time, but also to another 50 billion years before the evolution stage. Spectral type main sequence ,cheap tiffany jewelry, stars

 

main sequence stars in the process of stellar evolution can be displayed on the HR diagram, is located in the upper left corner to the lower right corner, known as main sequence stars. HR diagram to show the evolution of stars, about 90?? of the HR diagram of stars in the upper left corner to the lower right corner of the strip on the side line is called the main sequence. Main sequence stars in the ,Tiffany Jewellery Outlet, main sequence stars. Star-forming ?cular cloud is located in the far-right figure the area, but with the ?cular cloud starts to contract, its temperature begins to rise, and slowly moved to the main sequence. When dying stars leave the main sequence, in addition to very low quality to the bottom left of the star will move to the top right of the massive star will move, here is the red giant and red supergiant region, are low light and high surface temperatures of stars . Has not been a supernova explosion would move to the bottom left of the star, where light is low and high surface temperature region, is a white dwarf are located, and then because of the loss of energy, the lights become a black dwarf. The concept of ,Tiffany Jewelry On Sale, the main sequence HR diagram main sequence is located on the diagonal curve, most of the stars are located in this range, in this region is known as main sequence stars or dwarf stars, which Zeyi the lowest temperature of red dwarfs. Characteristics of this line is very obvious, because as long as continued progress of hydrogen fusion, stellar spectral type and brightness of the star is directly related to the quality, but almost all the ,Tiffany Rings, star's life at this stage to spend. When observed more closely, you will notice is no longer the main sequence with a clear line, anti to be somewhat blurred. There are many reasons why this ambiguous situation, the main reason is the uncertainty on the observations, because the impact of distance, making the number of binary not be distinguished. However, even in an ideal observation, the main sequence with a still somewhat confusing, because the quality is not the only star parameters, chemical composition and & mdash related - ,Tiffany Accessories, evolution of the situation will change slightly in the main sequence star belt position. For example, the close companion star, rotation or magnetic field, will cause some changes. Specifically, some of the metal-poor stars (sub-dwarf star), located on the bottom of the main sequence, as for the nuclear fusion of hydrogen, but the lower end of the main sequence will cause confusion because the chemical composition of the situation . Astronomers sometimes referred to the age from this point start to increase the surface temperature and brightness. When stars are born will enter the main sequence, before dying will leave the main sequence. Sun is a main sequence star, the age is already 4.5 billion years old, spectral classification is ,Tiffany Bracelet, G2V. When the kernel runs out of hydrogen, it will expand into a red giant. Information HR diagram spectral type brown dwarf white dwarf star red dwarf star plays dwarf star dwarf star (main sequence stars) plays star star bright star supergiant hypergiant absolute - magnitude (MV) in the following table ,Tiffany Charms, is a main sequence star of the typical values: luminosity (L), radius (R), and quality (M) are compared with respect to the value of the sun, the correct value can be 20-30?? of the variation. Stellar classification is similar to the color field o?ained by the color photography. (Note: The following data and external links are not exactly the same time, the brightness per unit area did not follow the temperature (T4) ratio) radius of the star classification of the quality of brightness temperature R / R M / M L / L K O2.7 25 127 5,500,000 52,000 O5 14 58 800,000 46,000 B0 7.4 18 ,Tiffany Cufflinks, 20,000 30,000 B5 3.8 6.5 800 15,200 A0 2.5 3.2 80 9,600 A5 1.7 2.1 20 8,700 F0 1.4 1.7 6.0 7,200 F5 1.2 1.29 2.5 6,400 G0 1.05 1.10 1.26 6,000 G2 1.0 1.0 1.0 5,700 G5 0.93 0.90 0.79 5,500 K0 0.85 0.78 0.40 5,150 K5 0.74 0.69 0.16 4,450 M0 0.63 0.47 0.063 3,850 M5 0.32 0.21 0.0079 3,200 M8 0.13 0.10 0.0008 2,500 M9.5 0.10 0.08 0.0001 1,900 more entries Atlas Atlas Open Category: astronomy, astrophysics,