论文标题
非放射性脉动恒星作为微晶源
Non-radially pulsating stars as microlensing sources
论文作者
论文摘要
我们研究了非放射性脉动(NRP)恒星的微透明。使用具有不同值的L,m的球形谐波函数为恒星半径和温度制定脉动。研究了NRP恒星的微晶光曲线的特性,相对于不同的脉动模式。对于NRP恒星的微透明,光曲线不是放大曲线的简单乘法和源星的内在光度曲线,除非可以忽略有限源大小的效果。可以从模拟的光曲线得出三个主要结论。首先,对于具有$ M \ neq0 $的模式,当观看倾斜度更接近杆式时,对观察者的恒星光度随着脉冲阶段的变化很小。在这种情况下,高磁化的微化事件是色的,可以揭示这些源恒星的变异性。其次,脉动模式的某些组合产生了几乎退化的光度曲线(例如(L,m)=(3,0),(5,0))。除非镜头越过投影源,否则所得的微晶光曲线也会变性。最后,对于涉及M = 1的模式,恒星亮度中心与坐标中心不一致,而投影的源亮度中心随脉冲阶段在天空中移动。由于这种时间依赖于亮度质心的位移,放大峰的时间与镜头与亮度中心的最接近接近相吻合,而不是源坐标中心。 NRP恒星和苛性折射特征的二元微敏化是色的。
We study the microlensing of Non-Radially Pulsating (NRP) stars. Pulsations are formulated for stellar radius and temperature using spherical harmonic functions with different values of l,m. The characteristics of the microlensing light curves from NRP stars are investigated in relation to different pulsation modes. For the microlensing of NRP stars, the light curve is not a simple multiplication of the magnification curve and the intrinsic luminosity curve of the source star, unless the effect of finite source size can be ignored. Three main conclusions can be drawn from the simulated light curves. First, for modes with $m\neq0$ and when the viewing inclination is more nearly pole-on, the stellar luminosity towards the observer changes little with pulsation phase. In this case, high-magnification microlensing events are chromatic and can reveal the variability of these source stars. Second, some combinations of pulsation modes produce nearly degenerate luminosity curves (e.g., (l,m)=(3,0), (5,0)). The resulting microlensing light curves are also degenerate, unless the lens crosses the projected source. Finally, for modes involving m=1, the stellar brightness centre does not coincide with the coordinate centre, and the projected source brightness centre moves in the sky with pulsation phase. As a result of this time-dependent displacement in the brightness centroid, the time of the magnification peak coincides with the closest approach of the lens to the brightness centre as opposed to the source coordinate centre. Binary microlensing of NRP stars and in caustic-crossing features are chromatic.