行星状星云是中等质量恒星演化到最终阶段——白矮星的前身星.但行星状星云按其核星的光谱型或星云的化学组成可以分为不同类型,其中有一类行星状星云其核星光谱中不同电离度的碳发射线占着主要地位.如同对待富碳的Wolf-Rayet星一样,我...行星状星云是中等质量恒星演化到最终阶段——白矮星的前身星.但行星状星云按其核星的光谱型或星云的化学组成可以分为不同类型,其中有一类行星状星云其核星光谱中不同电离度的碳发射线占着主要地位.如同对待富碳的Wolf-Rayet星一样,我们可将它们分为不同的次型.Van der Hucht等人考虑到它们与正常WC相比光度要低得多。展开更多
Planetary nebulae are the progenetors of white dwarfs in the final evolution stage of stars with intermediate initial mass ( 1M_⊙【M_*【9M_⊙). The planetary nebulae can be devided into different groups according to ...Planetary nebulae are the progenetors of white dwarfs in the final evolution stage of stars with intermediate initial mass ( 1M_⊙【M_*【9M_⊙). The planetary nebulae can be devided into different groups according to the spectral type of their core stars. One of these groups, in which the spectrum is dominated by the carbon lines of different levels of ionization, is similar to the carbon-rich Wolf-Rayet stars. According to Van der Hucht展开更多
文摘行星状星云是中等质量恒星演化到最终阶段——白矮星的前身星.但行星状星云按其核星的光谱型或星云的化学组成可以分为不同类型,其中有一类行星状星云其核星光谱中不同电离度的碳发射线占着主要地位.如同对待富碳的Wolf-Rayet星一样,我们可将它们分为不同的次型.Van der Hucht等人考虑到它们与正常WC相比光度要低得多。
文摘Planetary nebulae are the progenetors of white dwarfs in the final evolution stage of stars with intermediate initial mass ( 1M_⊙【M_*【9M_⊙). The planetary nebulae can be devided into different groups according to the spectral type of their core stars. One of these groups, in which the spectrum is dominated by the carbon lines of different levels of ionization, is similar to the carbon-rich Wolf-Rayet stars. According to Van der Hucht
