Convection and convective overshooting in stars more massive than 10 M-circle dot
Convection and convective overshooting in stars more massive than 10 M-circle dot
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质量大于 10 M 圆点的恒星中的对流和对流超调
DOI：
10.1093/pasj/psu153
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发表时间：
2015
影响因子：
2.3
通讯作者：
Lue Guoliang
中科院分区：
文献类型：
--
作者：
Jin Jie;Zhu Chunhua;Lue Guoliang
我们研究了混合长度参数α和超射参数δ是如何影响质量大于10m⊙的恒星中对流核和对流包层的性质的。首先，我们表明，α值越大，混合越强，化学梯度越小，有效温度越高，恒星半径越小。然后我们发现，如果一颗恒星在主序列相期间发展出对流核心超调，那么该恒星将比没有核心超调的恒星更早进入红(超)巨星阶段。最后，我们发现对流包络导致了氢燃烧壳层上方氢分布的不连续。对流包络超调有利于赫兹斯普朗格-罗素图中蓝圈的出现。
We examine how the mixing length parameter αpand the overshooting parameter δovaffect the properties of convective cores and convective envelopes in stars more massive than 10M⊙. First, we show that a larger value of αpleads to a stronger mixing, a smaller chemical gradient, a higher effective temperature, and a smaller stellar radius. We then find that if a star develops convective core overshooting during the main sequence phase, the star will enter the red (super)giant phase earlier than a star without core overshooting. Finally, we find that a convective envelope leads to a discontinuity of the hydrogen profile above the hydrogen burning shell. Convective envelope overshooting can facilitate the occurrence of blue loop in the Hertzsprung–Russell diagram.