临界转动恒星Achernar的斜压结构与引力昏暗的精细研究

发布时间：2017-12-31 01:26

  本文关键词：临界转动恒星Achernar的斜压结构与引力昏暗的精细研究　出处：《物理学报》2016年04期 　论文类型：期刊论文

  更多相关文章： 转动 潮汐 斜压结构 引力昏暗

【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?/?_s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%.
[Abstract]:The rotation and tidal effect is very important physical factors affecting the stellar structure and evolution. According to the observation data of Achernar, deduced by perturbation theory of critical rotating stars Achernar respectively as the characteristics of the baroclinic structure of single and binary star of the distribution of the density of the physical quantities of Achernar are given. With the consideration of the isobaric surface and rotation the tide and deformation effect of single and binary Achernar model to study the phenomenon of gravity darkening. The results showed that the positive shear enhanced centrifugal force, reduce the equatorial acceleration of gravity and temperature, anti shear results on the contrary. The anti shear and rigid rotation does not fit on the Achernar gravity darkening observations. Rotation model is better than single star the star model is more in line with the Achernar equatorial and polar radius ratio of the observed values, but the angular velocity calculation than the observations. The comparison between theoretical calculation and observation results showed that when Ache The rotation speed of rnar is 465 10~ (-5) s~ (-1), and the positive shear rate / _s is 0.7851. The extreme temperature of Achernar is 16041 K, and the equator temperature is 12073 K.. The relative error between all theoretical calculations and observations is not more than 7%..

【作者单位】： 贵州大学理学院物理系;中国科学院天体结构与演化重点实验室;中国科学院国家天文台-贵州大学天文联合研究中心;
【基金】：国家自然科学基金(批准号:11463002) 中国科学院天体结构与演化重点实验室开放课题(批准号:OP201405) 贵州大学研究生创新基金(批准号:研理工2015055)资助的课题~~
【分类号】：P152
【正文快照】： 1引言近年来,很多研究者逐渐认识到转动效应是影响恒星结构和演化的非常重要的物理因素[1 10]1924年,von Zeipel[11]假设当恒星以角速度转动并且处于辐射平衡时,发现恒星表面的辐射流与有效重力加速度eff成正比,=()eff4π()即von Zeipel原理.这表明辐射流将随重力加速度的增大，

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