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arXiv 0908.2704astro-ph.SR
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经常性新星RS蛇夫座的膨胀星云遗迹(2006):II。哈勃空间望远镜成像与地基光谱学联合建模

The Expanding Nebular Remnant of the Recurrent Nova RS Ophiuchi (2006): II. Modeling of Combined Hubble Space Telescope Imaging and Ground-based Spectroscopy

V. A. R. M. Ribeiro, M. F. Bode, M. J. Darnley, D. J. Harman, A. M. Newsam, T. J. O'Brien, J. Bohigas, J. M. Echevarría, H. E. Bond, V. H. Chavushyan, R. Coster… 展开作者

V. A. R. M. Ribeiro, M. F. Bode, M. J. Darnley, D. J. Harman, A. M. Newsam, T. J. O'Brien, J. Bohigas, J. M. Echevarría, H. E. Bond, V. H. Chavushyan, R. Costero, R. Coziol, A. Evans, S. P. S. Eyres, J. León-Tavares, M. G. Richer, G. Tovmassian, S. Starrfield, S. V. Zharikov

摘要:

我们报告哈勃太空望远镜成像,获得155和449天后,2006年爆发的经常性新星RS蛇夫座,连同地面光谱观测,获得了从天文台国家天文台圣佩德罗Mártir,下加利福尼亚州,墨西哥和天文台Astrofísico吉列尔莫哈罗,在卡纳内亚,索诺拉州,墨西哥。在第一个时代的观测被用来作为输入模型的几何形状和运动学结构的不断发展的RS Oph星云遗迹。我们发现,建模的残余物包括两个不同的共同对齐的双极组件;低速,高密度的最里面(沙漏)的区域和一个更广泛的,高速(哑铃)的结构。这一整体结构与早期射电观测和光学干涉测量推断的结构一致。我们发现,在西瓣观察到的不对称性是由HST滤波器的轮廓所引起的仪器效应,因此表明该瓣正在接近观察者。然后,我们得出结论,该系统具有39 $^{+1}_{-10}$度的视线倾斜。这是在协议的倾斜度的双轨道和贷款支持的建议,这种形态是由于相互作用的爆发喷出物与吸积盘周围的中央白矮星和/或预先存在的红巨星风,是显着密集的赤道地区的双比在两极。还对第二个时期的HST观测进行了建模。然而,由于在这个时期没有光谱,因此更难以约束任何模型。尽管如此,我们证明了两个HST时期之间的外部哑铃结构似乎线性扩展。

英文摘要:

We report Hubble Space Telescope imaging, obtained 155 and 449 days after the 2006 outburst of the recurrent nova RS Ophiuchi, together with ground-based spectroscopic observations, obtained from the Observatorio Astronómico Nacional en San Pedro Mártir, Baja California, México and at the Observatorio Astrofísico Guillermo Haro, at Cananea, Sonora, México. The observations at the first epoch were used as inputs to model the geometry and kinematic structure of the evolving RS Oph nebular remnant. We find that the modeled remnant comprises two distinct co-aligned bipolar components; a low-velocity, high-density innermost (hour glass) region and a more extended, high-velocity (dumbbell) structure. This overall structure is in agreement with that deduced from radio observations and optical interferometry at earlier epochs. We find that the asymmetry observed in the west lobe is an instrumental effect caused by the profile of the HST filter and hence demonstrate that this lobe is approaching the observer. We then conclude that the system has an inclination to the line of sight of 39$^{+1}_{-10}$ degrees. This is in agreement with the inclination of the binary orbit and lends support to the proposal that this morphology is due to the interaction of the outburst ejecta with either an accretion disk around the central white dwarf and/or a pre-existing red giant wind that is significantly denser in the equatorial regions of the binary than at the poles. The second epoch HST observation was also modeled. However, as no spectra were taken at this epoch, it is more difficult to constrain any model. Nevertheless, we demonstrate that between the two HST epochs the outer dumbbell structure seems to have expanded linearly.

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