Six months of mass outflow and inclined rings in the ejecta of V1494 Aql
Six months of mass outflow and inclined rings in the ejecta of V1494 Aql
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V1494 Aql 喷射物六个月的质量流出和斜环
DOI：
10.1111/j.1365-2966.2005.08829.x
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发表时间：
2005
影响因子：
4.8
通讯作者：
V. Elkin
中科院分区：
文献类型：
--
作者：
S. Eyres;I. Heywood;T. O’brien;R. Ivison;T. Muxlow;V. Elkin
V1494 Aql 是一颗速度非常快的新星，到 1999 年 12 月 3 日达到了视觉最大值 mv≃ 4.0。我们报告了发现后 4 到 284 天的观测结果，包括亚毫米和厘米带通量、单个 MERLIN 图像和 410 到 700 nm 范围内的光谱。无线电连续发射的范围与最近 1.6 kpc 的较低距离估计一致。我们得出的结论是，光学和无线电发射来自相同的膨胀喷射物。我们表明，这些观察结果与过去用于解释这些物体中无线电通量密度的上升和下降的简单运动球壳模型不一致。解析的残余结构与喷射物内密度增强的倾斜环一致。光谱表明物质喷射可能持续超过 195 天，在爆发后 195 至 285 天之间的某个时间，材料在可见光中变得光学稀薄。
V1494 Aql was a very fast nova which reached a visual maximum of mv≃ 4.0 by the end of 1999 December 3. We report observations from 4 to 284 d after discovery, including submillimetre- and centimetre-band fluxes, a single MERLIN image and optical spectroscopy in the 410 to 700 nm range. The extent of the radio continuum emission is consistent with a recent lower distance estimate of 1.6 kpc. We conclude that the optical and radio emission arises from the same expanding ejecta. We show that these observations are not consistent with simple kinematical spherical shell models used in the past to explain the rise and fall of the radio flux density in these objects. The resolved remnant structure is consistent with an inclined ring of enhanced density within the ejecta. Optical spectroscopy indicates likely continued mass ejection for over 195 d, with the material becoming optically thin in the visible sometime between 195 and 285 d after outburst.