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arXiv 2203.02722astro-ph.SR
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双径向模$δ$盾牌座恒星BP飞马座的星震学

Asteroseismology of the double-radial mode $δ$ Scuti star BP Pegasi

Jadwiga Daszyńska-Daszkiewicz, P. Walczak, A. A. Pamyatnykh, W. Szewczuk

摘要:

利用ASAS数据,我们确定了高振幅$δ$ Sct星Pegasi的脉动频率。分析只发现了两个已知的独立频率。在多色Strömgren测光的基础上,我们独立地发现,这两个频率只能与径向模式,根据频率比,基本和第一泛音模式。拟合两个频率的模型强烈依赖于不透明度数据。对于混合长度参数$α_{\rm MLT}\approx 0.5$的低值,只有在主序后演化阶段的OPAL地震模型被捕获在观测误差框内。只有当我们将$α_{\rm MLT}$增加到至少2.0时,地震OP和OPLIB模型才能达到误差框。然后,包括非绝热参数$f$到我们的地震建模,我们约束各种参数,采用基于蒙特卡罗的贝叶斯分析。

英文摘要:

Using the ASAS data, we determine the pulsational frequencies of the high-amplitude $δ$ Sct star BP Pegasi. The analysis revealed only the two known, independent frequencies. On the basis of multicolour Strömgren photometry, we independently find that both frequencies can only be associated with radial modes which, according to the frequency ratio, are fundamental and first overtone modes. The models fitting the two frequencies depend strongly on the opacity data. For low values of the mixing length parameter $α_{\rm MLT}\approx 0.5$, only the OPAL seismic models in the post-main sequence phase of evolution are caught within the observed error box. Seismic OP and OPLIB models can only reach the error box if we increase $α_{\rm MLT}$ to at least 2.0. Then, including the non-adiabatic parameter $f$ into our seismic modelling, we constrain various parameters, employing Monte Carlo-based Bayesian analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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