2005年10月V838 Monocerotis的Keck/HIRES光谱
Keck/HIRES spectroscopy of V838 Monocerotis in October 2005
摘要：
V838 Mon在2002年初爆发，成为一颗非常明亮的恒星。在各种解释爆发性质的方案中，最有希望的是恒星合并事件。本文研究了恒星及其周围环境在爆发后阶段的观测特性。2005年10月，我们利用凯克一号望远镜获得了V838 Mon的高分辨率光谱，确定了光谱中存在的许多原子特征和分子谱带，并提供了这些特征的图谱。为了提高光谱解释，我们进行了简单的分子带建模。我们的分析表明，光谱主要是由分子吸收的特点，在光球区的温度为2400 K和较冷的外层，在那里的温度下降到500 K。观察到中性碱金属的一些共振线，显示P-Cyg轮廓。特别有趣的是许多突出的发射线[FeII]。所有这些都表现出几乎相同的轮廓，这可以很好地描述了一个洛伦兹轮廓。在光谱的蓝色部分，很容易看到B型伴星的光球特征。用合成谱拟合了观测谱，得到的参数与B_3V型一致。我们还估计了伴星的径向速度和自转速度。
英文摘要：
V838 Mon erupted at the beginning of 2002 becoming an extremely luminous star. Among various scenarios proposed to explain the nature of the outburst the most promising is a stellar merger event. In this paper we investigate the observational properties of the star and its surroundings in the post outburst phase. We have obtained a high resolution optical spectrum of V838 Mon in October 2005 using the Keck I telescope.We have identified numerous atomic features and molecular bands present in the spectrum and provided an atlas of those features. In order to improve the spectrum interpretation we have performed simple modeling of the molecular bands. Our analysis indicates that the spectrum is dominated by molecular absorption features arising in photospheric regions with temperatures of ~2400 K and in colder outer layers, where the temperature decreases down to ~500 K. A number of resonance lines of neutral alkali metals are observed to show P-Cyg profiles. Particularly interesting are numerous prominent emission lines of [FeII]. All of them show practically the same profile, which can be well described by a Lorentzian profile. In the blue part of the spectrum photospheric signatures of the B-type companion are easily seen. We have fitted the observed spectrum with a synthetic one and the obtained parameters are consistent with the B3V type. We have also estimated radial and rotational velocities of the companion.
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