Radio emission from nova shells
Radio emission from nova shells
复制标题
新星外壳的无线电发射
DOI：
10.1086/112585
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
R. Newell
中科院分区：
文献类型：
--
作者：
R. Hjellming;C. M. Wade;N. Vandenberg;R. Newell
本文报道了Delphini HR 1967、Serpentis FH 1970和Cygni V1500 1975等新星的多频射电数据，这些数据涵盖了膨胀电离新星壳层射电“光”曲线的大部分主要阶段。一个简单的解决方案，球对称的质量和动量守恒方程，以适应所有三个新星的无线电数据，只有三个参数。对于10000 K的电子温度和800、650和1400 pc的距离，HR Del、FH Ser和V1500 Cyg壳层的相应参数为：质量为8.6 x 10/sup -5/、4.5 x 10/sup -5/和2.4 x 10/sup -4/太阳质量，内部速度为200、48和200 k/s，外部速度为450、1006，和5600 k/s。在加入初始有限厚度参数后，模型预测结果与天鹅座V1500的红外数据符合得很好。所有三颗新星的模型的主要特点是强密度和速度梯度。每个新星壳的可观测部分在关键阶段发生变化，内部的高密度部分最终占主导地位。
Multifrequency radio data for the novae HR Delphini 1967, FH Serpentis 1970, and V1500 Cygni 1975 are reported which cover most of the major stages of the radio ''light'' curves of expanding, ionized nova shells. A simple solution to the equations of mass and momentum conservation with spherical symmetry is shown to fit the radio data for all three novae with only three parameters. For electron temperatures of 10000 K and distances of 800, 650, and 1400 pc, the respective parameters for the shells of HR Del, FH Ser, and V1500 Cyg are: masses of 8.6 x 10/sup -5/, 4.5 x 10/sup -5/, and 2.4 x 10/sup -4/ solar masses, inner velocities of 200, 48, and 200 k/s, and outer velocities of 450, 1006, and 5600 k/s. With the addition of initial finite thickness parameters the model predictions and the infrared data of V1500 Cygni are in good agreement. The main features of the models for all three novae are strong density and velocity gradients. The observable part of each nova shell changes during critical stages, with the inner, higher density portions eventually dominating.