AI 中文总结
研究利用MESA - RSP模型构建造父变星合成观测波段光变曲线，将模型输出转化为星等，对比模型与观测振幅，发现虽MIST - BC变换必要，但模型序列存在振幅差异，主要因模型非线性脉动振幅小。
AI 中文摘要
观测波段光变曲线对造父变星脉动模型的检验比仅通过周期匹配更强，因为测量的光度振幅取决于相位相关的光度、温度、半径和通带变换。我们用MESA - RSP计算的非线性径向脉动模型构建了造父变星的合成观测波段光变曲线。将模型输出转化为热星等和在Bessell及Gaia通带中的MIST热改正星等。采用的AAVSO约翰逊V波段模板峰峰值振幅为0.8390星等，而模型给出的合成振幅远小于观测值，即便增强振幅的模型也仅达到观测值的4.4%。结果表明MIST - BC变换对有物理意义的观测波段比较是必要的，但当前模型序列仍存在振幅差异，主要限制是模型的非线性脉动振幅小而非热改正变换本身。
英文摘要
Observed-band light curves provide a stronger test of Cepheid pulsation models than period matching alone, because the measured photometric amplitude depends on the phase-dependent luminosity, temperature, radius, and passband transformation. We construct synthetic observed-band light curves for delta Cephei from nonlinear radial pulsation models computed with MESA-RSP and transform the model outputs L(phi), Teff(phi), and R(phi) into bolometric magnitudes and MIST bolometric-correction magnitudes in Bessell and Gaia passbands. The adopted AAVSO Johnson V-band template has peak-to-peak amplitude Delta V_obs = 0.8390 mag. The period-stable reference model with RSP alfam = 0.60 gives a MIST-BC V-band amplitude of only Delta V_syn approximately 0.0106 mag. Amplitude-enhanced models increase the synthetic amplitude, with RSP alfam = 0.425 giving 0.0302 mag, RSP alfam = 0.400 giving 0.0344 mag, and the accepted RSP alfam = 0.400, RSP alfat = 0.095 model giving 0.0367 mag. The final accepted model therefore reaches only 4.4 percent of the observed Johnson V-band amplitude. These results show that MIST-BC transformations are necessary for a physically meaningful observed-band comparison, but they do not remove the amplitude discrepancy in the present model sequence. The remaining mismatch indicates that the dominant limitation is the small nonlinear pulsation amplitude of the models rather than the bolometric-correction transformation itself.
Comments16 pages, 5 figures, 4 tables
