论文标题
白色矮人信封的新导电不熟悉
New Conductive Opacities for White Dwarf Envelopes
论文作者
论文摘要
由于它们的连续冷却和相对简单性，白矮星恒星通常被用来测量恒星种群的年龄。白矮人作为宇宙计量器的有用性取决于准确的冷却模型的可用性。这些模型的关键要素是导电性泥泞，在很大程度上控制了冷却速率。在这项工作中，我们提出了改进的导电性不适当，以表征中等耦合和中等变性的状态，这表征了DA和DB白矮人的重要部分。我们发现我们的计算和Cassisi等人常用的不透明性之间的差异。 （2007年），我们将其归因于电子电子散射的改进说明。冷却模型受到导电不透明的变化的强烈影响：4000 K白色矮人的年龄可以降低多达2 Gyr。我们为我们的新不熟悉性提供了分析拟合，以促进在白矮人进化代码中实施这一重要效果。
Thanks to their continuous cooling and relative simplicity, white dwarf stars are routinely used to measure the ages of stellar populations. The usefulness of white dwarfs as cosmochronometers depends on the availability of accurate cooling models. A key ingredient of those models are the conductive opacities, which largely govern the cooling rate. In this work, we present improved conductive opacities for the regime of moderate coupling and moderate degeneracy that characterizes an important portion of the envelopes of DA and DB white dwarfs. We find differences of up to a factor 3 between our calculations and the commonly used opacities of Cassisi et al. (2007), which we attribute to an improved account of electron-electron scattering. The cooling models are strongly affected by those changes in the conductive opacities: the age of a 4000 K white dwarf can be reduced by as much as 2 Gyr. We provide analytical fits to our new opacities to facilitate the implementation of this important effect in white dwarf evolution codes.
