We examine Hubble Space Telescope (HST)/STIS data, complemented with International Ultraviolet Explorer (IUE) data, to delineate interstellar absorption of highly ionized species, C iv, Si iv, and N v, and low ionization species toward four stars in Cygnus. Previous IUE studies indicate two major velocity complexes for C iv and Si iv extending across Cygnus. We see interstellar N v in HST/STIS data for HD 190918 and Cyg X-1. In both stars, the N v is at the velocities of interstellar C iv and Si iv. In HD 190918, the N v is weak, possibly due to enhanced X-ray ionization produced by this binary system. The Cyg X-1 data are of low signal-to-noise, but N v is quite strong with a small b-value, indicating N v arises in a cooler H ii region resulting from X-ray Auger ionization by Cyg X-1.

我们检查哈勃太空望远镜 (HST)/STIS 数据，并辅以国际紫外探测器 (IUE) 数据，以描绘天鹅座四颗恒星对高电离物质 C  iv、 Si  iv和 N  v和低电离物质的星际吸收. 先前的 IUE 研究表明，C  iv和 Si  iv有两个主要的速度复合体在天鹅座上延伸。我们在 HD 190918 和 Cyg X-1 的 HST/STIS 数据中看到了星际 N  v。在两颗恒星中，N  v的速度都与星际 C  iv和 Si  iv相同。在 HD 190918 中，N  v很弱，可能是由于这个二元系统产生的增强的 X 射线电离。Cyg X-1 数据的信噪比低，但 N  v相当强，b值小，表明 N  v出现在较冷的 H  ii区域，这是由 Cyg X-1 的 X 射线俄歇电离引起的.