CAJ | 학술논문

转动和潮汐效应是影响双星系统结构和演化不可忽略的重要物理因素。根据大质量双星系统V478 Cyg的观测结果，检验了提出的转动潮汐变形的理论模型。将转动潮汐变形的模型与传统的双星演化模型对比发现：转动和潮汐效应使恒星外层(低于平均密度区)发生的形变远大于内层；恒星两极点重力加速度变大，赤道面上重力加速度变小；转动潮汐变形模型具有较大的半径、赤道速度和中心集中度，较低的氢核能产生率，恒星向低温和低光度端演化。此外，大质量双星系统V478 Cyg由潮汐形变造成的拱线运动速率大于转动形变造成的拱线运动速率，广义相对论效应造成的拱线运动最小。由于主星具有较高的中心集中度，次星潮汐、转动形变造成的拱线运动速率均大于主星相应的拱线运动速率。
전동화조석효응시영향쌍성계통결구화연화불가홀략적중요물리인소。근거대질량쌍성계통V478 Cyg적관측결과，검험료제출적전동조석변형적이론모형。장전동조석변형적모형여전통적쌍성연화모형대비발현：전동화조석효응사항성외층(저우평균밀도구)발생적형변원대우내층；항성량겁점중력가속도변대，적도면상중력가속도변소；전동조석변형모형구유교대적반경、적도속도화중심집중도，교저적경핵능산생솔，항성향저온화저광도단연화。차외，대질량쌍성계통V478 Cyg유조석형변조성적공선운동속솔대우전동형변조성적공선운동속솔，엄의상대론효응조성적공선운동최소。유우주성구유교고적중심집중도，차성조석、전동형변조성적공선운동속솔균대우주성상응적공선운동속솔。
Rotation and tide are two important factors which have an influence on the stellar structure and evolution. They cannot be neglected. According to the observation data of the massive binary system V478 Cyg, we test the theoretical model including the deformation which is induced by rotation and tide (our model). We compare our model with K?hler-Eggleton (KE) model, and the distorted model is more consistent with observations than the traditional model (KE model). Besides, it is found that great deformation occurs in the outer envelope, where its density is lower than the mean density. Rotation and tide can cause the gravity at the two polar points to increase and the gravity in the equatorial plane to decrease. Therefore, the radiative flux, which depends on the local effective gravity, is not constant on the equipotentials any more. The poles which become hotter, experience a high mass loss than the equator, which becomes cooler. Furthermore, the two components in our model have bigger radii, equatorial velocities and central compactness and low H-energy production rate. The bigger mean radius of the distorted star produces a smaller temperature gradient inside the star, resulting in a lower energy transport. The lower energy generation rate inside the distorted model will widen the main sequence and increase the stellar lifetime. Stellar temperature and luminosity of the distorted model are shifted toward lower value. The tidal distortion inside the secondary star plays a most important role in the rate of the apsidal motion because of lower compactness. The apsidal motion derived from rotation is larger than the one derived from the general relativity.