摘要
按照通常的局部混合长理论，在红、黄巨星和超巨星对流区的顶部将出现超声速对流。作者对此提出了质疑，并提出了一种修正的混合长公式。与传统的理论相比，对具相同质量、光度和有效温度的恒星，新理论预期一较浅的对流区，超声速对流也被有效地抑制了。其结果是在ＨＲ 图上，红超巨星支向低温方向移动了１００４００Ｋ；而对中低光度恒星的结构和演化性质却没有任何可察的影响。
When the usual mixing length theory is applied in the calculation of convection envelope of late giants and super giants, it is found that the convection becomes supersonic in the top of convection zone. The authors review the original mixing length theory and give a set of modified mixing length formula. New theory predicts a shallower convection envelope for a given super giant in comparison with the usual mixing length theory. The supersonic convection is effectively restained. The red super giant branch moves to lower effective temperature by 100 400 K.
关键词
对流
超巨星
局部混合长理论
超声波
convection, stellar, evolution, supergiants, late type stars
