标题： 建模Ap Si型恒星MX TrA的TESS光变曲线 显示英文标题

标题： Modelling the TESS light curve of Ap Si star MX TrA

摘要： TESS的硅Ap星MX TrA的光变曲线使用之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进行了建模。 理论光变曲线是通过具有个别化学丰度的逐线恒星大气模型的合成通量网格计算得到的。 观测到的TESS光变曲线与合成光变曲线拟合，精度优于0.001~mag。 估计了Si和Fe丰度分层对变异性振幅的影响。 同时模拟了光度振幅和最大光亮度相位的波长依赖性，显示了Ap Si星的典型行为，即在远紫外区域由于通量再分配导致振幅增加和反相变异性。 显示英文摘要

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.