Optical Spectral Monitoring of XTE J1118+480 in Outburst: Evidence for a Precessing Accretion Disk?
Optical Spectral Monitoring of XTE J1118+480 in Outburst: Evidence for a Precessing Accretion Disk?
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XTE J1118 480 爆发中的光谱监测：进动吸积盘的证据？
DOI：
10.1086/339282
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
U. N. Dame
中科院分区：
文献类型：
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作者：
M. Torres;P. Callanan;M. Garcia;J. McClintock;P. Garnavich;Z. Balog;P. Berlind;Warren R. Brown;M. Calkins;A. M. U. College;Cork;Ireland;H. C. F. Astrophysics;U. N. Dame
我们展示了 2000 年 3 月爆发后不同时期获得的 X 射线瞬态 XTE J1118+480 的光谱观测结果。我们发现，发射线轮廓在比 4.1 小时轨道周期更长的时间尺度上显示出双峰结构的变化。我们认为这些变化是由于潮汐驱动的进动盘造成的。更强烈的巴尔默线和 He II λ4686 线的多普勒成像显示了圆盘上叠加的持续强度增强区域的证据，这可能与气流、热点或两者有关。我们讨论了系统中光通量的可能来源，并得出结论，这可能是由于粘性加热的磁盘造成的。
We present spectroscopic observations of the X-ray transient XTE J1118+480 acquired during different epochs following the 2000 March outburst. We find that the emission line profiles show variations in their double-peak structure on timescales longer than the 4.1 hr orbital period. We suggest that these changes are due to a tidally driven precessing disk. Doppler imaging of the more intense Balmer lines and the He II λ4686 line shows evidence of a persistent region of enhanced intensity superposed on the disk which is probably associated with the gas stream, the hot spot, or both. We discuss the possible origins of the optical flux in the system and conclude that it may be due to a viscously heated disk.