Metal-deficient planet

Japanese: 金属欠乏星 - きんぞくけつぼうせい
Metal-deficient planet
A star with a lower ratio of heavy elements than a standard star. It is so named because the spectral lines of heavy elements, especially metallic elements, are weak in its spectrum. Many metal-poor stars are high-velocity stars that exhibit large relative spatial motion with respect to the solar system.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
重元素の割合が標準の星のそれより小さい恒星。スペクトルでは重元素のうち特に金属元素のスペクトル線が弱いことからこの名がある。金属欠乏星の多くは，太陽系に対して大きな相対空間運動を示す高速度星である。

出典　株式会社平凡社百科事典マイペディアについて　情報

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