Helium ionization driving in Beta Cephei stars.
Helium ionization driving in Beta Cephei stars.
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氦电离驱动仙王座β恒星。
DOI：
10.1086/112308
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
R. Stellingwerf
中科院分区：
文献类型：
--
作者：
R. Stellingwerf
在一系列的非绝热线性脉动分析中，He/sup +/电离边缘（这是负责附近的T=1.5 × 10/sup 5/ K的不透明度功能）的不稳定效应被证明。这种机制在H-R图上与所观察到的区域几乎一致的区域内是最有效的。beta..仙王座变星。虽然实际的不稳定性是没有得到与标准模型，它表明，这可能很容易是由于近似模型和不透明度分辨率高于T=10/sup 5/ K。稍微修改的模型，并显示出良好的一致性与观察到的不稳定带。beta..造父变星
In a series of nonadiabatic linear pulsation analyses, the destabilizing effect of the He/sup +/ ionization edge (which is responsible for an opacity feature near T=1.5 x 10/sup 5/ K) is demonstrated. This mechanism is shown to be most effective in a region of the H--R diagram nearly coincident with that of the observed ..beta.. Cephei variables. Although actual instability is not obtained with standard models, it is shown that this could easily be due to approximations in the models and poor opacity resolution above T=10/sup 5/ K. Slightly modified models are presented that do show an instability strip in good agreement with observed ..beta.. Cepheids.