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arXiv 1303.6592astro-ph.SR
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发现后0.8至250天的T Pyxtrophic(2011)的光谱和光度发展

Spectroscopic and Photometric Development of T Pyxidis (2011) from 0.8 to 250 Days After Discovery

F. Surina, R. A. Hounsell, M. F. Bode, M. J. Darnley, D. J. Harman, F. M. Walter

摘要:

我们通过编制SMEI和AAVSO观测数据库,研究了2011年爆发期间T Pyx的光学光变曲线。SMEI光变曲线提供了发现后t=1.5-49天内前所未有的高节奏数据细节,根据理想的新星光学光变曲线分为四个阶段:初始上升,最大前停止(或“平台”),最终上升和早期下降。SMEI光变曲线的变化揭示了在视觉最大值之前0.04天的1.44 \pm的强烈检测期。在t=0.8-80.7和155.1-249.9天期间对LT和SMARTS望远镜的光谱进行了研究。这颗新星在其上升的早期就被观测到了,并且有一个明显的高速喷射阶段。导出的射血速度出现明显下降,然后逐渐增加。在这里,我们提出了两个不同阶段的质量损失,一个短暂的阶段发生后立即爆发,随后是一个更稳定的发展和更高的质量损失阶段。整体光谱的发展如下典型的经典新星和比较的光度行为揭示了与简单的演变伪光球模型的新星爆发。光谱也比较X射线和无线电光变曲线。弱[Fe X] 6375 A发射在X射线发射上升之前被边缘检测到。在X射线光变曲线的平台的中间是一致的,在光谱中检测到的高电离物种的出现和高频无线电通量的峰值。

英文摘要:

We investigated the optical light curve of T Pyx during its 2011 outburst through compiling a database of SMEI and AAVSO observations. The SMEI light curve, providing unprecedented detail with high cadence data during t=1.5-49 days post-discovery, was divided into four phases based on the idealised nova optical light curve; the initial rise, the pre-maximum halt (or the 'plateau'), the final rise, and the early decline. Variation in the SMEI light curve reveals a strongly detected period of 1.44\pm0.04 days before the visual maximum. The spectra from the LT and SMARTS telescopes were investigated during t=0.8-80.7 and 155.1-249.9 days. The nova was observed very early in its rise and a distinct high velocity ejection phase was evident. A marked drop and then gradual increase in derived ejection velocities were present. Here we propose two different stages of mass loss, a short-lived phase occurring immediately after outburst followed by a more steadily evolving and higher mass loss phase. The overall spectral development follows that typical of a Classical Nova and comparison to the photometric behaviour reveals consistencies with the simple evolving pseudo-photosphere model of the nova outburst. The optical spectra are also compared to X-ray and radio light curves. Weak [Fe X] 6375A emission was marginally detected before the rise in X-ray emission. The middle of the plateau in the X-ray light curve is coincident with the appearance of high ionization species detected in optical spectra and the peak of the high frequency radio flux.

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