The IUE MEGA Campaign: The Rotationally Modulated Wind of ζ Puppis
The IUE MEGA Campaign: The Rotationally Modulated Wind of ζ Puppis
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IUE MEGA 活动： z Puppis 的旋转调制风
DOI：
10.1086/309710
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
D. Massa
中科院分区：
文献类型：
--
作者：
I. Howarth;R. Prinja;D. Massa
我们讨论了在o4i (n)f星ζ Pup光谱中对Si IV重态（λ1400）的16天密集IUE观测。数据显示蓝移吸收的大部分是连续变化的。这些数据的时间序列分析显示，在19.2小时和5.2天的周期内，我们分别将其与“离散吸收成分”（DACs）和光球旋转周期的平均重复时间相一致。这些结果表明，风具有全局的纵向不对称性（接近光学深度的2倍），可能与大规模的磁性结构有关，但表明DACs与这颗恒星的特定经度没有直接关系。在光球吸收线变率中确定的8.5小时周期的谱线没有显著的功率，在x射线观测报告的16.7小时周期谱线也没有显著的功率。
We discuss 16 days of intensive IUE observations of the Si IV doublet (λ1400) in the spectrum of the O4 I(n)f star ζ Pup. The data show continuous variability throughout the greater part of the blueshifted absorption. Time series analysis of these data reveals significant power at periods of 19.2 hr and 5.2 days, which we identify with the mean recurrence time of “discrete absorption components” (DACs) and the photospheric rotation period, respectively. These results indicate that the wind has a global longitudinal asymmetry (approaching a factor 2 in optical depth), possibly associated with large-scale magnetic structures, but suggest that the DACs are not directly associated with specific stellar longitudes in this star. There is no significant power in the lines at the 8.5 hr period identified in photospheric absorption-line variability, nor at the 16.7 hr period reported in X-ray observations.