The effects of winds and coronae of hot stars on the infrared and radio continua
The effects of winds and coronae of hot stars on the infrared and radio continua
复制标题
热恒星的风和日冕对红外和射电连续谱的影响
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
L. Hartmann
中科院分区：
文献类型：
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作者：
J. Cassinelli;L. Hartmann
红外和射电连续统的形成理论被扩展到包括陡峭的温度梯度和日冕的影响。最近的哥白尼卫星观测表明，来自热恒星的风中存在高温区。我们考虑的模型中，温度是大的，只有在一个小范围内的半径。热恒星风的密度足够高，可以在机械能沉积停止的地方进行复合以冷却气流。由于自由-自由不透明度的λ/sup 2/依赖性，在风中出现长波长的过量辐射。我们发现日冕区域在红外连续光谱中引起了一个大约20- 100的大的隆起。Mu.. m的最大超过几乎2马格。密度分布随高度的变化也可能导致营业额在连续的能量分布，但是，只有温度下降，发生在复合区域，可能会导致光谱梯度比瑞利-金斯梯度陡得多。
The theory of the formation of infrared and radio continua is extended to include the effects of steep temperature gradients and coronae. The presence of high-temperature zones in the winds from hot stars has been suggested by recent Copernicus satellite observations. We consider models in which the temperature is large only over a small range in radius. The density in the winds of hot stars is high enough for recombination to cool the flow where mechanical energy deposition ceases. Excess radiation at long wavelengths arises in the winds because of the lambda/sup 2/ dependence of free--free opacity. We find the coronal region causes a broad bump in the infrared continuum at about 20--100 ..mu..m with a maximum excess of almost 2 mag. Variations of the distribution of density with height can also cause turnover in the continuous energy distribution; however, only temperature decreases, as occurs in the recombination region, can cause spectral gradients much steeper than the Rayleigh-Jeans gradient.