论文标题
白色矮人,主序列星和巨星肢体朝向系数的多普勒束带因子3D(DA和DB)白色矮人模型
Doppler beaming factors for white dwarfs, main sequence stars, and giant stars Limb-darkening coefficients for 3D (DA and DB) white dwarf models
论文作者
论文摘要
我们计算了DA,DB和DBA白色矮人模型的多普勒光束因子,以及主要序列和巨型恒星,涵盖了Sloan,Ubvri,Hipercam,Kepler,Kepler,Tess和Gaia光度系统的传输曲线。使用最小二乘法对这些光度法进行了最小二乘法对3D模型进行了肢体变形系数的计算。 使用恒星气氛的现实模型的光束因子计算表明,黑体近似不准确,尤其是对于过滤器$ u $,$ u'$,$ u $,$ u $,$ g $,$ g $,$ g'$和$ b $。黑体方法仅适用于高有效温度和/或较长有效波长。因此,为了对光曲线进行更准确的分析,我们建议使用本文介绍的光束因子。关于肢体变形,3D模型的特定强度的分布表明,通常,这些模型对肢体的明亮不如其1D对应物,这意味着更陡峭的曲线。为了更好地描述这些强度,我们建议使用四项法律(也适用于1D模型),鉴于基于地球的工具和空间任务(例如Kepler和Tess(以及将来的Plato))所达到的精度水平。
We computed Doppler beaming factors for DA, DB, and DBA white dwarf models, as well as for main sequence and giant stars covering the transmission curves of the Sloan, UBVRI, HiPERCAM, Kepler, TESS, and Gaia photometric systems. The calculations of the limb-darkening coefficients for 3D models were carried out using the least-squares method for these photometric systems. The beaming factor calculations, which use realistic models of stellar atmospheres, show that the black body approximation is not accurate, particularly for the filters $u$, $u'$, $U$, $g$, $g'$, and $B$. The black body approach is only valid for high effective temperatures and/or long effective wavelengths. Therefore, for more accurate analyses of light curves, we recommend the use of the beaming factors presented in this paper. Concerning limb-darkening, the distribution of specific intensities for 3D models indicates that, in general, these models are less bright toward the limb than their 1D counterparts, which implies steeper profiles. To describe these intensities better, we recommend the use of the four-term law (also for 1D models) given the level of precision that is being achieved with Earth-based instruments and space missions such as Kepler and TESS (and PLATO in the future).