恒星内部的贯穿对流(英文)

贯穿对流是恒星演化理论长期未获很好解决的理论问题。尽管它已有近五十年的研究历史 ,但至今人们对贯穿对流仍存在很多的错误的理解。究其原因是因为人们对贯穿对流的理解依然停留在唯象的混合长理论图象上。根据一种非局部对流理论 ,我们揭示了贯穿对流区的结构。在太阳下部的贯穿对流区 ,温度梯度是亚绝热的 ,但是是超辐射的。本文还对恒星对流理论给出了一个简短的评述。

THE CONVECTION OVERSHOOTING IN STELLAR INTERIOR

Convection overshooting is a long standing theoretical problem in the theory of stellar evolution. Although its research has a history of nearly 50 years, up to the present there are still many misunderstandings in the recognition of the structure about overshooting zone. The cause is that our understanding of overshooting still rests on the picture of phenomenological mixing length throry. With a non local convection model, this paper reveals the structure of convection overshooting zone. In the lower overshooting zone of the Sun, the temperature gradient is subadiabatic and super radiative, and there is no any near discontinuity in temperature gradient. In the present paper a brief review of stellar convection is also presented.