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在紫外线下,RS CVn二进制系统 (IM Pegasi) 的磁性活动和光谱行为
M R Sanad1, H I Abdel Rahman1, W A Badawy2
1Astronomy Department, National Research Institute of Astronomy and Geophysics, Helwan, Cairo, 11421, Egypt.
Scientific reports
|December 12, 2025
概括
国际紫外线探测器对IM Pegasi的观测显示了其大气中的耀斑活动. 频谱变化与磁场周期有关,燃烧由当前的表格模型解释.
科学领域:
- * 天体物理学 * 天体物理学
- * 恒星天文学 恒星天文学
- * 光谱分析分析
背景情况:
- *RS Canum Venaticorum (RS CVn) 双星是活跃的恒星系统.
- *IM Pegasi是一个长周期,单行RS CVn二进制.
- * 了解恒星大气层需要详细的观察.
研究的目的:
- *分析IM Pegasi的紫外线光谱行为.
- * 为了确定恒星大气中的物理条件.
- * 调查耀斑活动和光谱变化.
主要方法:
- *利用了国际紫外线探测器 (IUE) 1981-1992年的数据.
- *分析了排放线流和轨道相.
- *使用2200 Å的吸收特征评估星际红色.
主要成果:
- * 在染色体和过渡区域观察到火焰活动.
- *编目排放线变化为高,中,低.
- *计算的质量损失率 (~1.2 × 10-10 M yr-1),发射区域温度 (~9.2 × 104 K),耀斑能量 (~5.6 × 1039 erg) 和紫外线发光度 (~1.23 × 1030 erg s-1).
- *没有发现有意义的星际红色 (E(B-V) = 0).
结论:
- *光谱变化归因于周期性磁场行为.
- * 耀斑活动与当前的表格模型一致.
- * IUE数据为RS CVn大气动态提供了洞察力.
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