恒星类太阳和类长周期变星脉动激发机制的理论探讨
发布时间:2018-04-03 04:15
本文选题:恒星 切入点:振荡 出处:《天文学报》2013年01期
【摘要】:利用一种非局部和非定常的恒星对流理论,计算了0.6~3.0 M_⊙恒星演化模型的线性非绝热脉动.结果表明,赫罗图上脉动不稳定带右方的脉动不稳定的低温恒星可以分成2大类(群).一类由主序矮星、亚巨星和中低光度红巨星组成的类太阳振荡恒星,它们的中高阶(径向阶n_r≥12)p模是脉动不稳定的,而低阶(n_r≤5)模是脉动稳定的;另一类是由亮的红巨星和渐近巨星支星(AGB)组成的类长周期变星,它们的低阶模(n_r≤5)是脉动不稳定的,而高阶模(n_r≥12)却是脉动稳定的.能利用对流与脉动的耦合统一解释造父变星脉动不稳定带红边界、类太阳和类长周期变星脉动.对赫罗图右方的低温恒星的中低阶p模振荡,对流与脉动的耦合是主要的脉动激发和阻尼机制,而湍流的随机激发机制仅对类太阳振荡高阶p模重要.
[Abstract]:Based on a nonlocal and unsteady theory of stellar convection, the linear nonadiabatic pulsation of the 0.6 ~ (3. 0) M _ (-)-298 stellar evolution model is calculated.The results show that the low temperature stars with pulsation instability in the right side of the pulsating instability band on the Hero diagram can be divided into two categories.A class of sun-like oscillating stars consisting of main order dwarf star, subgiant star and low luminosity red giant star is pulsating stable (radial order nr 鈮,
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