磁氦特殊星的扭曲表面：对一个Cen的应用
Distorted surfaces of magnetic helium-peculiar stars: An application to a Cen
摘要：
氦特殊的磁性化学特殊的恒星在其表面显示出氦丰度的变化。由于相关的大气尺度高度变化，恒星表面变得扭曲，富氦区域向内凹陷。实际上，在由于不透明效应而导致的通量变化之上，凹陷的富氦表面区域在光学区域中变得不那么亮，而在紫外线区域中变得更亮。本文研究了非球面对日冕光变曲线的观测效应。我们采用由多普勒成像得到的He、N、O、Si和Fe的表面分布，并引入与氦丰度成正比的畸变效应，模拟了该恒星的光变曲线。我们发现，虽然大部分的光学和紫外线的变化，这颗星的结果，由于氦和铁的不均匀的表面分布的流量重新分配，减少光的变化，由于氦相关的表面扭曲导致模拟的光学光变曲线和光变曲线与BRITE卫星观察到的更好的协议。
英文摘要：
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.
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