不稳定带
不稳定带是在赫罗图上接近垂直的一块区域，这是脉动变星(包括天琴座RR变星、造父变星、室女W型变星、鲸鱼ZZ型变星、金牛RV型变星、盾牌δ型变星、凤凰SX型变星和快速震荡Ap星)分布的区域。
不稳定带横断主序带的A和F型星(1-2太阳质量)，并几乎向上垂直扩展(稍有向右倾斜)直至最明亮的区域。不稳定带的底部在赫罗图上的赫氏空隙。
Instability strip
中文百科
英语百科
Instability strip 不稳定带
The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap (roAp) stars near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the supergiants.
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