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arXiv 2409.02547astro-ph.SR
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Ap Si 星 MX TrA 的 TESS 光变曲线建模

Modelling the TESS light curve of Ap Si star MX TrA

Yu. Pakhomov, I. Potravnov, A. Romanovskaya, T. Ryabchikova

AI总结:

本文利用多普勒成像获得的表面化学分布和逐线大气模型合成通量,对 Ap Si 星 MX TrA 的 TESS 光变曲线进行高精度建模,并分析了 Si、Fe 丰度分层及波长依赖性对光变的影响。

摘要:

利用先前通过多普勒成像技术获得的硅、铁、氦和铬的观测表面分布,对硅 Ap 星 MX TrA 的 TESS 光变曲线进行了建模。理论光变曲线使用来自逐线恒星大气模型、具有各自化学丰度的合成通量网格计算。观测 TESS 光变曲线由合成光变曲线拟合,精度优于 0.001 mag。估算了 Si 和 Fe 丰度分层对光变振幅的影响。此外,对测光振幅和最大光相位的波长依赖性进行了建模,显示出 Ap Si 星在远紫外波段因通量再分布而呈现的典型行为,即振幅增大和反相变化。

英文摘要:

The TESS light curve of the silicon Ap star MX TrA was modelled using the observational surface distribution of silicon, iron, helium, and chromium obtained previously with the Doppler Imaging technique. The theoretical light curve was calculated using a grid of synthetic fluxes from line-by-line stellar atmosphere models with individual chemical abundances. The observational TESS light curve was fitted by synthetic one with an accuracy better than 0.001~mag. The influence of Si and Fe abundance stratification on the amplitude of variability was estimated. Also the wavelength dependence of the photometric amplitude and phase of the maximum light was modelled showing the typical for Ap Si stars behaviour with increased amplitude and anti-phase variability in far ultraviolet caused by the flux redistribution.

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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