非局部对流理论及其在太阳模型中的应用(英文)

NON-LOCAL CONVECTION THEORY AND LTS APPLICATION TO SOLAR MODEL

在Li&Yang (2 0 0 1 )所给出的局部对流理论的基础上 ,我们进一步采用梯度型方案给出了非局部对流理论 ,并将它用于太阳模型中。这一理论考虑了恒星对流区内的非局部效应 ,它得到了一个与原来用混合长理论或局部理论给出的结果有所区别的对流区 ,扩散效应很明显。但是 ,目前我们的理论还不能处理时间相关的对流以及对流超射等问题。这些问题将在后续工作中加以考虑。当把这一理论应用于太阳模型中时 ,我们发现它对标准太阳模型的改正非常微小。我们讨论了这一现象 。

Based on the local turbulent convection theory given by Li & Yang (2001), we proposed a non local convection theory with a gradient type scheme, and applied it to solar models. The theory considers the non local effects in the interior of convection zone. It gives a convection zone with evident diffusion effects, which differs from the original one given by MLT or local convection theory. However, our theory cannot deal with the time dependent problems and overshooting now. These problems will be taken into account in our subsequent work. When applying this theory to solar models, we notice that it gives very tiny corrections to SSM. We discuss the phenomena as well as find the explanations.