论文标题
分析模型，用于差异旋转恒星上星空引起的光度变化
Analytic model for photometric variation due to starspots on a differentially rotating star
论文作者
论文摘要
我们提出了一个在差异旋转表面上具有非变化星形恒星的恒星的光曲线变化的分析模型。旋转周期谐波的傅立叶系数是根据位置的纬度表达的，$ \ ell_ {s} $和观察者的视线方向，$ \ ell_ {o} $，包括肢体变暗效果。我们根据模型生成多点的不同实现，并对所得的Lightcurve调制进行模拟观察。我们讨论从期刊分析中恢复斑点的特性和差分旋转定律的参数。尽管我们的分析模型忽略了恒星表面上的斑点的演变（动态运动，创建和歼灭），但它提供了一个基本框架来解释恒星的光度变化，尤其是从现有的开普勒数据和未来的太空出生任务中。它也适用于各种天文对象旋转引起的光度调制。
We present an analytic model of the lightcurve variation for stars with non-evolving starspots on a differentially rotating surface. The Fourier coefficients of the harmonics of the rotation period are expressed in terms of the latitude of the spot, $\ell_{s}$, and the observer's line-of-sight direction, $\ell_{o}$, including the limb darkening effect. We generate different realizations of multi-spots according to the model, and perform mock observations of the resulting lightcurve modulations. We discuss to what extent one can recover the properties of the spots and the parameters for the differential rotation law from the periodogram analysis. Although our analytical model neglects the evolution of spots on the stellar surface (dynamical motion, creation and annihilation), it provides a basic framework to interpret the photometric variation of stars, in particular from the existing Kepler data and the future space-born mission. It is also applicable to photometric modulations induced by rotation of various astronomical objects.
