转动双星模型及演化

A model for rotating binary stars and its evolution

提出了转动双星的结构和演化模型,给出了主星的重力势,并模拟其加速度在等势面上的分布.结果表明在忽略自引力势高阶项的情况下,极地处重力加速度最大,赤道上长轴顶点处重力加速度最小.自转、公转和伴星潮汐作用力的联合效应降低了子星的有效温度,延长了子星在氢主序上的演化时间.

A model for rotating binary stars is presented. The potential of the primary is derived and the gravitational acceleration is simulated. We only consider the first order in the potential of the gravitational potential. The results show that the gravitational acceleration reaches the maximum value at polar region and goes down the minimum value at the top of the longest axis. Moreover, due to the combined effect of the spin and tide, the effective temperature of the two components decreases for some extent. As a result, the life time of the two components is prolonged on their main sequence.