论文标题
一个越过赫兹普伦差距的提议
A Propos Crossing the Hertzsprung Gap
论文作者
论文摘要
中间质量和巨大恒星的演变在完成氢芯燃烧后会大大加快。由于这种加速的进化，在这一集中观察恒星的可能性很小。在合适的恒星聚集体中，特别是适当年龄的星形簇，快速进化阶段会导致人口降低的区域〜-〜被称为hertzsprung gap〜-〜在色彩效果图和衍生物中。速度的解释通常诉诸于星星的Kelvin-Helmholtz时尺和Schönberg-Chandrasekhar的不稳定性。该博览会以反例挑战了这一观点，并认为适当定义的核时尺度足以解释快速发展。即使热不稳定性在恒星中发展为通过赫兹普朗缝隙发展，也不是触发现象的必要条件。
The evolution of intermediate-mass and massive stars speeds up considerably after they finish their hydrogen core-burning. Due to this accelerated evolution, the probability to observe stars during this episode is small. In suitable stellar aggregates, in particular star clusters of appropriate ages, the fast evolutionary phase causes a depopulated area~--~referred to as the Hertzsprung gap~--~in color-magnitude diagrams and derivatives therefrom. The explanation of the speed-up usually resorts to the star's Kelvin-Helmholtz timescale and the Schönberg-Chandrasekhar instability is called upon. This exposition challenges this viewpoint with counterexamples and argues that a suitably defined nuclear timescale is enough to explain the fast evolution. A thermal instability, even though it develops in stars evolving through the Hertzsprung gap, is not a necessary condition to trigger the phenomenon.
