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arXiv 0810.0166astro-ph
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麦哲伦星云中的脉动B星和Be星

Pulsating B and Be stars in the Magellanic Clouds

P. D. Diago, J. Gutiérrez-Soto, J. Fabregat, C. Martayan, J. Suso

摘要:

主序星B型恒星的脉动是由铁族不透明度凸起引起的$κ$机制驱动的。目前的模型不能预测在B光谱域中存在不稳定带在非常低的金属丰度。由于麦哲伦云(MC)的金属丰度已被测量为小麦哲伦云(SMC)的$Z=0.002$和大麦云(LMC)的$Z=0.007$左右,它们构成了一个非常合适的对象来测试这些预测。这项工作的目的是调查存在的B-型闪烁在低金属丰度,寻找短期的周期性变化,在一个大样本的B和Be星的MC与准确确定的基本天体物理参数。

英文摘要:

Stellar pulsations in main-sequence B-type stars are driven by the $κ$-mechanism due to the Fe-group opacity bump. The current models do not predict the presence of instability strips in the B spectral domain at very low metallicities. As the metallicity of the Magellanic Clouds (MC) has been measured to be around $Z=0.002$ for the Small Magellanic Cloud (SMC) and $Z=0.007$ for the Large Magellanic Cloud (LMC), they constitute a very suitable objects to test these predictions. The aim of this work is to investigate the existence of B-type pulsators at low metallicities, searching for short-term periodic variability in a large sample of B and Be stars from the MC with accurately determined fundamental astrophysical parameters.

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