转动潮汐变形双星理论模型研究

CORC > 云南天文台 > 中国科学院云南天文台 > 中国科学院天体结构与演化重点实验室

	转动潮汐变形双星理论模型研究
	詹琼 1; 宋汉峰1,2,3 ; 邰丽婷 1; 王江涛 1
刊名	物理学报(ACTA PHYSICA SINICA)
	2015-04-20
卷号	64 期号:8
关键词	恒星结构与演化(stellar structure and evolution) 转动(rotation) 潮汐(tide) 拱线运动(apsidal motion)
ISSN号	1000-3290
其他题名	Theoretical model of the rotationally and tidally distorted binaries
中文摘要	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.
英文摘要	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 Kähler-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.
学科主题	天文学 ; 地球物理学
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	EVOLUTIONARY MODELS ; STELLAR STRUCTURE ; LOW-MASS ; STARS ; SYSTEMS
收录类别	SCI
原文出处	http://wulixb.iphy.ac.cn/CN/10.7498/aps.64.089701
语种	中文
WOS记录号	WOS:000354059200055
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9219]
专题	云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.贵州大学理学院物理系 2.中国科学院天体结构与演化重点实验室, 昆明 650011 3.中科院国家天文台-贵州大学天文联合研究中心, 贵阳 550025
推荐引用方式 GB/T 7714	詹琼,宋汉峰,邰丽婷,等. 转动潮汐变形双星理论模型研究[J]. 物理学报(ACTA PHYSICA SINICA),2015,64(8).
APA	詹琼,宋汉峰,邰丽婷,&王江涛.(2015).转动潮汐变形双星理论模型研究.物理学报(ACTA PHYSICA SINICA),64(8).
MLA	詹琼,et al."转动潮汐变形双星理论模型研究".物理学报(ACTA PHYSICA SINICA) 64.8(2015).