樱井的目标：2003年至2007年期间近红外CO喷出物的特征
Sakurai's Object: characterising the near-infrared CO ejecta between 2003 and 2007
摘要：
我们目前的观测樱井的对象之间获得的1- 5微米2003年和2007年。通过对4.7 μ m附近的CO基本吸收特征的阶梯光谱拟合辐射转移模型，确定了谱线形成区的激发条件。我们发现12 C/13 C ~3.5，这与CO起源于非常晚的热脉冲处理的喷出物相一致，而不是在预先存在的行星状星云中。我们证明了在尘埃外部存在2.2e-6<M<2.7e-6 Msun的CO喷出物，形成500+/-80 km/s的高速风。我们发现的证据显着减弱的CO带和冷却的尘埃周围的中央恒星在2003年和2005年之间。气体和尘埃的温度高得难以置信，恒星辐射是唯一的贡献者。
英文摘要：
We present observations of Sakurai's Object obtained at 1-5um between 2003 and 2007. By fitting a radiative transfer model to an echelle spectrum of CO fundamental absorption features around 4.7um, we determine the excitation conditions in the line-forming region. We find 12C/13C~3.5, consistent with CO originating in ejecta processed by the very late thermal pulse, rather than in the pre-existing planetary nebula. We demonstrate the existence of 2.2e-6<M<2.7e-6 Msun of CO ejecta outside the dust, forming a high-velocity wind of 500+/-80 km/s. We find evidence for significant weakening of the CO band and cooling of the dust around the central star between 2003 and 2005. The gas and dust temperatures are implausibly high for stellar radiation to be the sole contributor.
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