造父一型星的MESA-RSP光变曲线的傅里叶形态诊断
Fourier Morphology Diagnostics of Delta Cephei MESA-RSP Light Curves
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中文总结 AI 辅助
本研究针对造父一型星，通过傅里叶形态诊断对比观测与MESA-RSP模型的光变曲线，发现校准序列仅适度改善合成振幅，尚未达到观测振幅要求。
中文摘要 AI 辅助
傅里叶形态为非线性造父变星模型是否再现观测到的谐波含量和不对称光变曲线形状（而非仅脉动周期）提供了紧凑的检验。我们将傅里叶和时域形态诊断应用于观测到的及合成的造父一型星（Delta Cephei）光变曲线。观测到的约翰逊V波段光变曲线由傅里叶模板表示，并与经校准的MESA-RSP模型序列生成的MIST测光校正V波段光变曲线进行比较。本研究以目标特定的形态评估为框架，而非作为一种新的傅里叶分解方法。观测模板的ΔV=0.8390 mag、R₂₁=0.3401、R₃₁=0.1943、上升分数=0.2775、不对称指数=0.4450。最终接受的模型（RSP_alfam=0.400，RSP_alfat=0.095）给出合成ΔV_syn=0.0367 mag、R₂₁=0.0185、R₃₁=0.0028、上升分数=0.4860、不对称指数=0.0280。因此，接受的校准序列仅适度改善了合成振幅，且使合成曲线过于正弦化。结果表明，该接受序列已进行周期校准和形态检验，但尚未成为造父一型星的观测振幅解决方案。
英文摘要
Fourier morphology provides a compact test of whether a nonlinear Cepheid model reproduces the observed harmonic content and asymmetric light-curve shape, not only the pulsation period. We apply Fourier and time-domain morphology diagnostics to observed and synthetic Delta Cephei light curves. The observed Johnson V-band light curve is represented by a Fourier template and compared with MIST bolometric-correction V-band light curves generated from the calibrated MESA-RSP model sequence. This study is framed as a target-specific morphology assessment rather than as a new Fourier-decomposition method. The observed template has Delta V = 0.8390 mag, R21 = 0.3401, R31 = 0.1943, rise fraction = 0.2775, and asymmetry index = 0.4450. The final accepted model, with RSP_alfam = 0.400 and RSP_alfat = 0.095, gives Delta V_syn = 0.0367 mag, R21 = 0.0185, R31 = 0.0028, rise fraction = 0.4860, and asymmetry index = 0.0280. The accepted calibration sequence therefore improves the synthetic amplitude only modestly and leaves the synthetic curve much too sinusoidal. The result shows that the accepted sequence is period-calibrated and morphology-tested, but it is not yet an observed-amplitude solution for Delta Cephei.
