“BHB stars”的版本间差异
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（以“A kind of Population II star, found in the galactic halo and especially in globular clusters, that has evolved past the red giant stage and is now ...”为内容创建页面） |
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A kind of Population II star, found in the |
A kind of Population II star, found in the galactic halo and especially in globular clusters, that has evolved past the red giant stage and is now burning helium in its core. Blue horizontal-branch (BHB) stars are typically of spectral type B3 to A0 (hence very blue in color), and have spectra characterized by strong, sharp hydrogen lines, a large Balmer, and very weak lines of other elements. |
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BHB stars are found on the horizontal branch of the Hertzsprung-Russell diagram to the left, blue side of RR Lyrae variables. They are very good tracers because of their extreme brightness and the fact that most faint blue stars seen in the halo are usually BHB stars. |
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2014年11月21日 (五) 08:50的最新版本
A kind of Population II star, found in the galactic halo and especially in globular clusters, that has evolved past the red giant stage and is now burning helium in its core. Blue horizontal-branch (BHB) stars are typically of spectral type B3 to A0 (hence very blue in color), and have spectra characterized by strong, sharp hydrogen lines, a large Balmer, and very weak lines of other elements.
BHB stars are found on the horizontal branch of the Hertzsprung-Russell diagram to the left, blue side of RR Lyrae variables. They are very good tracers because of their extreme brightness and the fact that most faint blue stars seen in the halo are usually BHB stars.