Instability strip

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  • Instability strip
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Abstract from DBPedia
    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 stars (roAps) near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the supergiants. RV Tauri variables are also often considered to lie on the instability strip, occupying the area to the right of the brighter Cepheids (at lower temperatures), since their stellar pulsations are attributed to the same mechanism.

    不安定帯（ふあんていたい、Instability strip）は、脈動変光星が占めるヘルツシュプルング・ラッセル図におけるほぼ垂直の領域である。 主系列星のA型とF型（1から2太陽質量）の領域を分断しており、若干右に曲がりながらほぼ垂直に最大光度の位置まで伸びている。不安定帯の下の方は、ヘルツシュプルングの間隙と呼ばれる。

    (Source: http://dbpedia.org/resource/Instability_strip)