The comparison of all unpublished archival IUE spectra of the bright spectroscopic binary α Draconis shows that the far-ultraviolet flux has remained constant over the 18 yr of the mission, except possibly for one spectrum which shows significantly less flux below 1800 Å. The Si ii lines undergo large radial velocity variations which are due to the orbital motion of α Draconis around the center of mass of the system. The far-UV energy distribution of α Draconis has more flux than that of Sirius A (α CMa) which reflects the weaker abundances of the metals in α Draconis compared to Sirius A.

中文翻译：

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IUE记录的Alpha Draconis紫外光谱

明亮的所有未发布档案IUE光谱的比较光谱二进制α血竭表明远紫外线通量一直保持在18年的任务的常数，除了可能用于一个频谱示出显著较少磁通低于1800Å。所述Si  II线经受大的径向速度变化，这是由于轨道运动α血竭围绕该系统的质量中心。的远紫外能量分布α血竭具有比天狼星A（的多种焊剂α CMA），其反映了金属的丰度较弱α血竭相比天狼星A.