飞马座AG的持续缓慢下降
The Continuing Slow Decline of AG Pegasi
摘要：
我们分析光学和紫外观测的共生二进制AG飞马座在1992年至1997年期间获得的。从1980-1985年到1997年，热分量的辐射光度下降了2-3倍。自1992年以来，热部件的有效温度可能下降了10%-20%，但这种下降与测量误差相当。对H-β和He I辐射的光学观测显示出明显的照明效应，其中来自热组分的高能光子照亮了红巨星的外层大气。简单的照明模型一般占的光学和紫外线发射线通量的大小。高电离发射线- [Ne V]，[Mg V]和[Fe VII] -表明光电离红巨星风外部的机械加热。这种辐射可能起源于距离中心双星$\sim$ 30-300 AU的低密度区。
英文摘要：
We analyze optical and ultraviolet observations of the symbiotic binary AG Pegasi acquired during 1992-97. The bolometric luminosity of the hot component declined by a factor of 2-3 from 1980-1985 to 1997. Since 1992, the effective temperature of the hot component may have declined by 10%-20%, but this decline is comparable to the measurement errors. Optical observations of H-beta and He I emission show a clear illumination effect, where high energy photons from the hot component ionize the outer atmosphere of the red giant. Simple illumination models generally account for the magnitude of the optical and ultraviolet emission line fluxes. High ionization emission lines - [Ne V], [Mg V], and [Fe VII] - suggest mechanical heating in the outer portions of the photoionized red giant wind. This emission probably originates in a low density region $\sim$ 30-300 AU from the central binary.
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