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首页> 外文期刊>The Astrophysical Journal. Letters >The recurrent nova T Pyx: Distance and remnant geometry from light echoes
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The recurrent nova T Pyx: Distance and remnant geometry from light echoes

机译：复发性新星T Pyx：光回波的距离和残余几何形状

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摘要

The recurrent nova T Pyxidis (T Pyx) is well known for its small binary separation, its unusually high luminosity in quiescence, and the spectacular Hubble Space Telescope (HST) images of its surrounding remnant. In 2011 April, T Pyx erupted for the first time since 1966. Here we describe HST observations in late 2011 of a transient reflection nebula around the erupting white dwarf. Our observations of this light echo in the pre-existing remnant show that it is dominated by a clumpy ring with a radius of about 5″ and an inclination of 30°-40°, with the eastern edge tilted toward the observer. The delay times between the direct optical light from the central source and the scattering of this light from dust in several clumps with the same foreground distance as the central source give a distance to T Pyx of 4.8 ± 0.5 kpc. Given past evidence from two-dimensional optical spectra that the remnant contains a shell-like component, it must actually consist of a ring embedded within a quasi-spherical shell. The large distance of 4.8 kpc supports the contention that T Pyx has an extraordinarily high rate of mass transfer in quiescence, and thus that nova explosions themselves can enhance mass loss from a donor star, and reduce the time between eruptions in a close binary.
机译：复发性新星T Pyxidis（T Pyx）以其小的二元分离，其静止时异常高的发光度以及周围残骸的壮观哈勃太空望远镜（HST）图像而闻名。在2011年4月，T Pyx自1966年以来首次爆发。在这里，我们描述了2011年末HST在爆发的白矮星周围观测到的瞬态反射星云的现象。我们对先前存在的残余物中的这种光回波的观察表明，它由一个半径约为5英寸，倾角为30°-40°的块状环控制，其东边缘向观察者倾斜。来自中心源的直接光学光与来自尘埃的光散射在几个与中心源具有相同前景距离的团块中的延迟时间之间，到T Pyx的距离为4.8±0.5 kpc。从二维光谱的过去证据来看，残余物包含壳状成分，它实际上必须由嵌入准球形壳内的环组成。 4.8 kpc的大距离支持了T Pyx在静止时具有非常高的质量传递速率的论点，因此新星爆炸本身可以增加来自供体恒星的质量损失，并减少两次近距离爆发之间的时间。

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