星风物质损失率对大中质量转动恒星演化的影响

The Influence of Mass Loss Rates on Evolution of Massive and Intermediate-mass Stars with Rotation

文章采用四个不同星风物质损失率公式,计算了5M⊙和15M⊙转动恒星的演化。通过对演化结果的比较发现:星风物质损失率的大小对大质量转动恒星演化的影响比对中质量恒星的影响要大;星风作用越大,恒星在HR图中的演化轨迹向低光度方向移动;而且较大的物质损失率降低了恒星内部CNO循环的反应速率,从而延长了恒星的演化寿命,并影响到恒星内部的密度和温度等各个物理量。

The different mass loss rates have been used in this paper to compute evolutionary models of stars with 5M⊙ and 15M⊙. The detailed comparison shows that the mass loss rates have more influence on massive--mass star than intermediate--mass star. As the mass loss rate increases, the evolutionary track in the HR diagram shifts to lower luminosity;with the increase of the mass loss rate, the speed of circulating reaction of CNO decreases, and the evolutionary lifetimes in different phases of stars become long. The mass loss rate also influences the interior central temperature, density and other physical quantities of star.