First Direct Measurement of Acceleration in the Outflow of a Nova: U Scorpii (1999)
First Direct Measurement of Acceleration in the Outflow of a Nova: U Scorpii (1999)
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首次直接测量新星流出的加速度：U Scorpii (1999)
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
D. Zurek
中科院分区：
文献类型：
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作者：
S. Lépine;M. Shara;M. Livio;D. Zurek
我们报告的第一个直接测量的加速流出的新星，U斯科，观察5天后开始爆发。哈勃太空望远镜上的空间望远镜成像光谱仪相机获得的强烈Hα发射线的光谱时间序列显示，一个明亮的发射成分在30分钟内以+0.16 ± 0.02的速度移动。这与具有视线加速度ar = +4.1 ± 0.5 m s-2的发射材料团块一致。数据表明，该团块位于中度准直的双极流出内。由于投影效应，这意味着团块相对于星星的实际加速度为100 + 25 m s-2。
We report the first direct measurement of acceleration in the outflow of a nova, U Sco, observed 5 days after the start of an outburst. Spectroscopic time series of the intense Hα emission line, obtained with the Space Telescope Imaging Spectrograph camera on board the Hubble Space Telescope, shows a bright emission component moving across the spectrum at a rate of +0.16 ± 0.02 Å in 30 minutes. This is consistent with a clump of emitting material having a line-of-sight acceleration ar = +4.1 ± 0.5 m s-2. The data suggest that this clump resides within a moderately collimated bipolar outflow. Due to projection effects, this implies an actual acceleration of the clump relative to the star of a ≳ +25 m s-2.