蓝回绕特性的研究  

Study on the Properties of the Blue Loops

作　　者：曾艺蓉[1] 

机构地区：[1]中国科学院国家天文台云南天文台,昆明650011

出　　处：《天文学报》2003年第2期103-109,共7页Acta Astronomica Sinica

摘　　要：研究了可以影响蓝回绕(blue loops)的各种主要因素,发现蓝回绕的形状和中心氦燃烧阶段的总产能率的变化相关联,而总产能率的变化主要来源于壳层氢燃烧和中心氦燃烧产能率的变化,所以蓝回绕主要与壳层氢燃烧和中心氦燃烧产能率的变化相联系。壳层氢产能率的变化主要与氢丰度变化区(μ-梯度区)的氢丰度分布轮廓(X-profile),μ-梯度区的温度,以及外对流区的深入程度密切相关。氦核的大小和温度会影响中心氦燃烧产能率的变化,中心氦燃烧产能率的变化不仅对总产能率的变化有贡献,而且也会影响亮层氢燃烧产能率的变化。The main factors which affecting the formation and extension of the blue loops of the middle mass stars are studied and the correlation between the feature of blue loops and the variation of the total energy production rate of the star during the core He-burning is found. The variation of the total energy production rate is mainly contributed by the H-burning shell and the core He-burning, the H-burning shell is dependent, however, on the temperature and the hydrogen profile in the μ-gradient region and the inward penetration of the outer convective zone. Both of the size of the He core and the temperature in the region of the He core determine the core He-burning which not only contributes to the total energy production rate, but also has influence on the H-burning shell.

关 键 词：蓝回绕 总产能率 壳层氢燃烧 中心氦燃烧 恒星 演化 

分 类 号：P144[天文地球—天体物理]