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球状星团中低光度红巨星的脉动稳定性
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作者 熊大闰 邓李才 《天文学报》 CSCD 北大核心 2006年第3期256-267,共12页
利用一种非定常的恒星非局部对流理论,对球状星团中低光度的红巨星进行了线性非绝热脉动理论计算.结果表明,对所有温度高于约5400 K模型的基音到4阶泛音都是脉动稳定的.随着恒星光度的增大,低阶泛音也变得脉动不稳定.对中低光度的红... 利用一种非定常的恒星非局部对流理论,对球状星团中低光度的红巨星进行了线性非绝热脉动理论计算.结果表明,对所有温度高于约5400 K模型的基音到4阶泛音都是脉动稳定的.随着恒星光度的增大,低阶泛音也变得脉动不稳定.对中低光度的红巨星,脉动稳定性非常低,接近中性稳定.因此他们将是不变星或非常小振幅的短周期变星(P<2天). 展开更多
关键词 恒星: 恒星:变星:一般 恒星:晚型星
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Effects of magnetic fields on equation of state of rotating stars
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作者 NA WeiWei LIN GuiFang HUANG RunQian 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第2期109-113,共5页
The evolution of rotating stars with magnetic fields has been studied with focus given to the following aspects: the effects of magnetic fields on equation of state for stellar matter and the thermodynamic quantities;... The evolution of rotating stars with magnetic fields has been studied with focus given to the following aspects: the effects of magnetic fields on equation of state for stellar matter and the thermodynamic quantities; the effects of magnetic energy and pressure on the internal structure of stars. The differences between the structure and evolution of a 15M⊙rotating star with and without magnetic fields are discussed. Our results show that the magnetic fields have an effect on the structure and evolution of the star mainly during the central helium burning phase; and this influences the physical quantities in the stellar envelope where hydrogen and helium are partially ionized. This may influence stellar pulsation. 展开更多
关键词 stars: magnetic fields stars: evolution stars: equation of state
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