船底座η星“Weigelt结”中的反电离带
Inverted Ionization Zones in Eta Carinae's "Weigelt Knots"
摘要:
Weigelt结,在eta Car附近密集缓慢移动的喷出物,在结构和起源上都是神秘的。使用一组特殊的光谱与HST/STIS获得,我们已经部分解决了一个结的电离区的精度约为10质量。与简单模型相反,较高的电离水平发生在结的外侧,即,远离恒星。它们不能代表弓形激波,目前还没有真正令人满意的解释--尽管我们粗略地勾勒出一种尝试性的可能性。我们强调,STIS光谱图提供了更可靠的空间测量的Weigelt结比HST图像做,这种技术也可以应用于结的自行问题。
英文摘要:
The Weigelt knots, dense slow-moving ejecta near eta Car, are mysterious in structure as well as in origin. Using a special set of spectrograms obtained with the HST/STIS, we have partially resolved the ionization zones of one knot to an accuracy of about 10 mas. Contrary to simple models, higher ionization levels occur on the_outer_ side of the knot, i.e., farther from the star. They cannot represent a bow shock, and no truly satisfying explanation is yet available -- though we sketch one tentative possibility. We emphasize that STIS spectrograms provide far more reliable spatial measurements of the Weigelt Knots than HST images do, and this technique can also be applied to the knots' proper motion problem.
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