Nova V4444 Sagittarii 1999: Spectropolarimetric Evidence for a Preexisting Circumstellar Dust Cloud
Nova V4444 Sagittarii 1999: Spectropolarimetric Evidence for a Preexisting Circumstellar Dust Cloud
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Nova V4444 Sagittarii 1999：先前存在的星周尘埃云的分光偏振证据
DOI：
10.1086/309339
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Okazaki
中科院分区：
文献类型：
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作者：
K. Kawabata;R. Hirata;Y. Ikeda;H. Akitaya;M. Seki;M. Matsumura;A. Okazaki
本文介绍了1999年人马座V4444新星早期的光学偏振光谱测量结果。从1999年4月29日（t = 2天）到1999年5月7日（t = 10天），在四个晚上进行了观察。偏振特性，包括在强发射线上没有偏振差异，在整个期间保持不变。观测到的偏振度随着波长的缩短而单调增加。我们从观测到的偏振分离的星际偏振组件，假设该组件固有的新星有一个幂律型的波长函数。分解的本征极化可以用小颗粒的散射来解释。这些结果表明，在新星附近的尘埃云的预先存在，至少有几十个Au从中央星星。
We present the results of our optical spectropolarimetry of nova V4444 Sagittarii 1999 in its early stage. The observations were performed on four nights from 1999 April 29 (t = 2 days) to 1999 May 7 (t = 10 days). The polarization properties, including the absence of polarization difference across strong emission lines, have remained unchanged through the period. The observed polarization degree increases monotonically toward shorter wavelength. We separate the interstellar polarization component from the observed polarization by assuming that the component intrinsic to this nova has a power-law-type function of wavelength. The decomposed intrinsic polarization can be explained by scattering due to small grains. These results suggest the preexistence of the dust cloud in the vicinity of the nova, at least several dozens of AU from the central star.