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arXiv 0902.2177astro-ph.SRastro-ph.GA
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RS Oph的光谱轨道和变化

Spectroscopic orbits and variations of RS Oph

E. Brandi, C. Quiroga, J. Mikolajewska, O. E. Ferrer, L. G. Garcia

摘要:

我们研究的目的是改进巨星的轨道根数,并推导出白矮星伴星的分光轨道。还研究了与2006年爆发有关的光谱变化。通过测量冷组分吸收线和宽的H α发射翼的径向速度,得到了光谱轨道,这些吸收线和宽的H α发射翼似乎与热组分有关。还分析了一组CF型吸收线与热分量运动的可能联系。新的周期为453.6天,质量比q=M_g/M_h=0.59。假设一颗大质量白矮星为热分量,M_h= 1.2-1.4 M_{\odot},红巨星质量为M_g= 0.68-0.80 M_{\odot},轨道倾角为i = 49-52^{ \circ }。CF型线与任一二元组分都不相关,并且最有可能在朝向热组分流动的材料中形成。我们还证实了RS Oph中LiI双重态的存在,其径向速度与M-巨星径向速度曲线拟合得很好。不管锂的产生机制如何,它的来源很可能来自冷巨星内部,而不是新星爆炸时被巨星捕获的物质。在2006年4月,大部分的发射谱线呈现出一个宽的基座,其中一个强而窄的分量在大约-20 km/s,另外两个扩展的发射分量在-200和+150 km/s。这些成分可能起源于双极气体外流,支持双极激波加热壳层通过垂直于双星轨道平面的冷成分风膨胀的模型。

英文摘要:

The aims of our study are to improve the orbital elements of the giant and to derive the spectroscopic orbit for the white dwarf companion. Spectral variations related to the 2006 outburst are also studied. The spectroscopic orbits have been obtained by measuring the radial velocities of the cool component absorption lines and the broad Halpha emission wings, which seem to be associated with the hot component. A set of cF-type absorption lines were also analyzed for a possible connection with the hot component motion. A new period of 453.6 days and a mass ratio, q=M_g/M_h=0.59 were determined. Assuming a massive white dwarf as the hot component, M_h= 1.2-1.4 M_{\odot}, the red giant mass is M_g= 0.68-0.80 M_{\odot} and the orbit inclination, i = 49-52^{\circ}. The cF-type lines are not associated with either binary component, and are most likely formed in the material streaming towards the hot component. We also confirm the presence of the LiI doublet in RS Oph and its radial velocities fit very well the M-giant radial velocity curve. Regardless of the mechanism involved to produce lithium, its origin is most likely from within the cool giant rather than material captured by the giant at the time of the nova explosion. In April 2006 most of the emission lines present a broad pedestal with a strong and narrow component at about -20 km/s and two other extended emission components at -200 and +150 km/s. These components could originate in a bipolar gas outflow supporting the model of a bipolar shock-heated shell expanding through the cool component wind perpendicularly to the binary orbital plane.

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