磁制动作用下太阳在主序阶段质量流失对自转角速度减速的影响

Influence of Mass Loss Due to Solar Wind on the Retardation of the Rotation Angular Velocity of the Sun on the Main Sequence under the Action of the Magnetic Braking

研究了磁制动作用下太阳在主序阶段质量流失对自转角速度在主序前半程和后半程随时间的演变的影响.根据推导给出了理论结果.理论结果表明:磁制动作用对自转角速度的影响在主序前半程比后半程影响更大.计算了在主序前半程(1×10~9–5×10~9yr)和后半程(5×10~9–10×10~9yr)内角速度演变的数值.数值结果表明:无论在主序前半程还是在后半程自转角速度随时间逐渐减慢.最后详细讨论了给出的理论和数值结果.

The retardation of the rotational angular velocity of the sun due to mass loss under the action of the magnetic braking in the pre-half and post-half time of the main sequence is studied. The theoretical results are given based on derivation. The theoretical results show that the influence of the magnetic braking action in the pre-half time is stronger than that in the post-half time of the main sequence. The numerical values of the retardation of angular velocity in the pre-half time （1 ×10^9-5×10^9 yr） and post-half time （5×10^9-10×10^9 yr） of the main sequence are calculated. The numerical results show that the rotational angular velocity decreases with time in both of the pre-half and post-half time of the main sequence. The theoretical and numerical results are discussed in detail.