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arXiv 1304.7650astro-ph.EP
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2011年10月Draconids爆发。II。来自火球光谱学的流星体化学丰度

The 2011 October Draconids Outburst. II. Meteoroid Chemical Abundances from Fireball Spectroscopy

J. M. Madiedo, J. M. Trigo-Rodriguez, N. Konovalova, I. P. Williams, A. J. Castro-Tirado, J. L. Ortiz, J. Cabrera-Caño

摘要:

2011年10月8日,地球穿越了19世纪末和20世纪初从21 P/Giacobini-Zinner彗星喷出的尘埃痕迹。这导致了10月天龙座流星雨活动的爆发,并组织了一个国际小组来分析这一事件。西班牙流星网络(SPMN)加入了这一倡议,并通过低亮度CCD相机记录了10月的天龙座流星雨。此外,还进行了光谱观测。记录了数十个多站流星轨迹,包括一个非常明亮的10月天龙座流星火球(绝对大小为-10.5),这是同时从位于安达卢西亚的三个SPMN流星观测站拍摄的。获得的光谱表明,随着火球深入大气层,发射谱线的相对强度发生了明显的变化。在这里,我们专注于分析这一显着的光谱,但也讨论了大气轨迹,大气渗透,并计算出的这可能是在21 P/Giacobini-Zinner返回近日点在1907年释放的火流星的轨道数据。讨论了10月天龙座流星体的谱和抗拉强度。这个非常明亮的火流星的主要岩石元素的化学剖面演化进行比较,获得的元素丰度为10月5日天龙座火球也记录在我们的光谱活动,但只在一个单一的站观察。小流星体之间的显着的化学异质性被发现,因为我们应该预期的彗星聚集正在形成的不同的尘埃成分。

英文摘要:

On October 8, 2011 the Earth crossed dust trails ejected from comet 21P/Giacobini-Zinner in the late 19th and early 20th Century. This gave rise to an outburst in the activity of the October Draconid meteor shower, and an international team was organized to analyze this event. The SPanish Meteor Network (SPMN) joined this initiative and recorded the October Draconids by means of low light level CCD cameras. In addition, spectroscopic observations were carried out. Tens of multi-station meteor trails were recorded, including an extraordinarily bright October Draconid fireball (absolute mag. -10.5) that was simultaneously imaged from three SPMN meteor ob-serving stations located in Andalusia. Its spectrum was obtained, showing a clear evolution in the relative intensity of emission lines as the fireball penetrated deeper into the atmosphere. Here we focus on the analysis of this remarkable spectrum, but also discuss the atmospheric trajectory, atmospheric penetration, and orbital data computed for this bolide which was probably released during 21P/Giacobini-Zinner return to perihelion in 1907. The spectrum is discussed together with the tensile strength for the October Draconid meteoroids. The chemical profile evolution of the main rocky elements for this extremely bright bolide is compared with the elemental abundances obtained for 5 October Draconid fireballs also recorded during our spectroscopic campaign but observed only at a single station. Significant chemical heterogeneity between the small meteoroids is found as we should expect for cometary aggregates being formed by diverse dust components.

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