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arXiv 2108.08149astro-ph.SR
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V838麒麟座尘埃的红外演化

The Infrared Evolution of Dust in V838 Monocerotis

C. E. Woodward, A. Evans, D. P. K. Banerjee, T. Liimets, A. A. Djupvik, S. Starrfield, G. C. Clayton, S. P. S. Eyres, R. D. Gehrz, R. M. Wagner

摘要:

发光红变星(LRV)最有可能是恒星合并的结果。V838 Mon是这类恒星中研究得最好的成员之一,代表了B型恒星合并的原型。由于合并事件,发生了类似新星的喷发,导致系统的质量损失。随着气体冷却,大量的星周尘埃形成。V838 Mon于2002年爆发,其尘埃成分、几何形状和红外光度正在发生非常动态的变化,提供了一个实时实验室来验证恒星合并和演化场景中的矿物学冷凝序列。我们讨论了最近的NASA平流层天文台红外天文SOFIA 5至38微米的观测结合档案NASA斯皮策光谱,文件的时间演变的新鲜形成的(在过去的20年)拱星材料在周围的V838星期一。在10微米的光谱区域的变化是强有力的证据,我们正在目睹一个经典的灰尘冷凝序列预计将发生在富氧的环境中,氧化铝的形成,其次是在温度冷却的硅酸盐。

英文摘要:

Luminous Red Variables (LRVs) are most likely eruptions that are the outcome of stellar mergers. V838 Mon is one of the best-studied members of this class, representing an archetype for stellar mergers resulting from B-type stars. As result of the merger event, nova-like eruptions occur driving mass-loss from the system. As the gas cools considerable circumstellar dust is formed. V838 Mon erupted in 2002 and is undergoing very dynamic changes in its dust composition, geometry, and infrared luminosity providing a real-time laboratory to validate mineralogical condensation sequences in stellar mergers and evolutionary scenarios. We discuss recent NASA Stratospheric Observatory for Infrared Astronomy SOFIA 5 to 38 micron observations combined with archival NASA Spitzer spectra that document the temporal evolution of the freshly formed (within the last 20 yrs) circumstellar material in the environs of V838 Mon. Changes in the 10 micron spectral region are strong evidence that we are witnessing a classical dust condensation sequence expected to occur in oxygen-rich environments where alumina formation is followed by that of silicates at the temperature cools.

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