临界转动恒星Achernar的斜压结构与引力昏暗的精细研究
其他题名Detail investigation of the inclined pressure structure and gravity darkening in critical rotating star Achernar
邰丽婷1; 宋汉峰1,2,3; 王江涛1
发表期刊物理学报(ACTA PHYSICA SINICA)
2016-02-20
卷号65期号:4
DOI10.7498/aps.65.049701
收录类别SCI ; EI
关键词转动(Rotation) 潮汐(Tide) 斜压结构(Inclined Pressure Structure) 引力昏暗(Gravitational Darkening)
其他摘要转动和潮汐效应是影响恒星结构和演化的非常重要的物理因素. 根据对Achernar的观测数据, 用扰动理论推导了临界转动恒星Achernar分别作为单星和双星的斜压结构的特征, 给出Achernar等压面上的密度等物理量的分布. 利用考虑转动和潮汐及形变效应的单、双星模型研究了Achernar的引力昏暗现象. 结果表明正剪切增强离心力、减小赤道的重力加速度和温度, 反剪切结果则与之相反. 反剪切和刚性转动情况并不符合对Achernar的引力昏暗观测结果. 发现转动双星模型比单星模型虽更符合Achernar赤道和极半径之比的观测值, 但理论计算的角速度比观测值小. 对比理论计算和观测结果发现, 当Achernar的自转角速度为4.65× 10-5 s-1, 正剪切率Ω/Ωs为0.7851时, Achernar的极点温度为16041 K, 赤道温度为12073 K. 所有理论计算与观测值的相对误差不超过7%.; Rotation and tide are two important factors that have very important impacts on the stellar structure and evolution. Based on the observational data of Achernar, we have derived the inclined pressure structure in a single rotating star or as a member in the binaries. We have given the distributions of the physical quantities on the isobaric surface and these distributions are derived from the Legendre series of expansions. We have also found the relationship between all levels of perturbation potential functions (including rotational and tidal distortions) and the distributions of density and pressure under the condition of inclined pressure structure. In particular, the gravitational darkening with the models including the effects of rotation and tide is investigated. We have found that the critical ratio of equatorial radius to the polar radius is consistent with the observations in rotating binaries better than that in single rotating model. The reason is that the tidal force can make the polar radius shortened because the tidal force exerts an inward force to the two polar points. However, the theoretical angular velocity in binaries is smaller than that observed. It is also shown that the positive shear enhances the centrifugal force and decreases the mean effective gravitational acceleration and effective temperatures whereas the negative shear plays a role to strengthen the effective gravitational acceleration. Moreover, the solid body rotation has not been supported inside Achernar because magnetic fields have not been detected through observations. Furthermore, the theoretical angular velocity in rigid rotation is higher than the angular velocity observed. Achernar has a periodic variation of light curves due to mass outburst, which also supports differential rotation. A positive shear indicates that the mass in accretion disks is falling to Achernar and the Achernar is spun up to critical rotation according to current observations. By comparing the theoretical results with observations, it can be seen that when the theoretical spin angular velocity of Achernar is 4.65 x 10(-5) s(-1) and the positive shears Omega/Omega(s) are 0.7851, the temperature of the polar points is 16041 K and that of equatorial sphere is 12073 K. Relative errors between the theoretical values and observations are less than 3% and are listed in the text. This model is the best and is the most possible one for Achernar.
项目资助者国家自然科学基金(11463002) ; 中国科学院天体结构与演化重点实验室开放课题(OP201405) ; 贵州大学研究生创新基金(研理工2015055)
语种中文
学科领域Physics
文章类型Article
ISSN1000-3290
URL查看原文
WOS记录号WOS:000371401000045
WOS研究方向Physics
WOS类目Physics, Multidisciplinary
关键词[WOS]EVOLUTIONARY MODELS ; STELLAR EVOLUTION ; ANGULAR-MOMENTUM ; LOW-MASS ; THEOREM
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9347
专题中国科学院天体结构与演化重点实验室
通讯作者宋汉峰
作者单位1.贵州大学理学院物理系, 贵阳 550025
2.中国科学院天体结构与演化重点实验室, 昆明 650011
3.中国科学院国家天文台-贵州大学天文联合研究中心, 贵阳 550025
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邰丽婷,宋汉峰,王江涛. 临界转动恒星Achernar的斜压结构与引力昏暗的精细研究[J]. 物理学报(ACTA PHYSICA SINICA),2016,65(4).
APA 邰丽婷,宋汉峰,&王江涛.(2016).临界转动恒星Achernar的斜压结构与引力昏暗的精细研究.物理学报(ACTA PHYSICA SINICA),65(4).
MLA 邰丽婷,et al."临界转动恒星Achernar的斜压结构与引力昏暗的精细研究".物理学报(ACTA PHYSICA SINICA) 65.4(2016).
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