论文标题
磁性氦气式星星的扭曲表面：应用于CEN
Distorted surfaces of magnetic helium-peculiar stars: An application to a Cen
论文作者
论文摘要
氦气磁性化学奇特的恒星显示出整个表面的氦气丰度的变化。由于相关的大气尺度变化，恒星表面会变形，富含氦气的区域向内凹陷。有效地，在由于不透明度效应引起的磁通变化的顶部，较低的氦气表面区域在光学区域的亮度较小，而在紫外线中则更明亮。我们研究了非球面对CEN光曲线的观察力作用。我们模拟该恒星的光曲线采用了来自多普勒映射的HE，N，O，Si和Fe的表面分布，并引入了与氦气丰度成比例的失真作用。我们表明，尽管由于氦气和铁的不均匀表面分布，该恒星的大部分光学和紫外线变化导致了通量重新分布，但由于氦相关的表面畸变而导致的光变化减少导致模拟光学光曲线和与Brite卫星观察到的光曲线之间的更好一致性。
Helium-peculiar magnetic chemically peculiar stars show variations of helium abundance across their surfaces. As a result of associated atmospheric scale height variations, the stellar surface becomes distorted, with helium-rich regions dented inwards. Effectively, on top of flux variations due to opacity effects, the depressed helium-rich surface regions become less bright in the optical regions and brighter in the ultraviolet. We study the observational effects of the aspherical surface on the light curves of a Cen. We simulate the light curves of this star adopting surface distributions of He, N, O, Si, and Fe derived from Doppler mapping and introducing the effect of distortion proportional to helium abundance. We show that while most of the optical and UV variations of this star result from flux redistribution due to the non-uniform surface distributions of helium and iron, the reduction of light variations due to the helium-related surface distortion leads to a better agreement between simulated optical light curves and the light curves observed with the BRITE satellites.
