模拟A星大气中的对流。HD108642的平分线和线形
Modelling convection in A star atmospheres. Bisectors and lineshapes of HD108642
摘要：
我们提出了一个代码，VeDyn，模拟信封和大气层的A至F星专注于准确处理对流过程。VeDyn实现了Canuto和Dubovikov（1998）的高度复杂的对流模型，但速度快，方便，足以用于实际的天体物理应用。我们开发了HME包络求解器，这个对流模型进一步一致的模拟信封连同恒星大气。合成代码SynthV被扩展以解释所得到的速度结构。最后，我们测试了我们的方法对原子线平分线。结果表明，我们的合成线平分线HD108642弯曲向蓝色和幅度相媲美的观察。尽管这种模拟对流的方法需要求解一个耦合的非线性微分方程组，但它的速度足够快，可以适用于依赖于模型大气的许多调查技术。
英文摘要：
We present a code, VeDyn, for modelling envelopes and atmospheres of A to F stars focusing on accurate treatment of convective processes. VeDyn implements the highly sophisticated convection model of Canuto and Dubovikov (1998) but is fast and handy enough to be used in practical astrophysical applications. We developed the HME envelope solver for this convection model furtheron to consistently model the envelope together with the stellar atmosphere. The synthesis code SynthV was extended to account for the resulting velocity structure. Finally, we tested our approach on atomic line bisectors. It is shown that our synthetic line bisectors of HD108642 bend towards the blue and are of a magnitude comparable to the observed ones. Even though this approach of modelling convection requires the solution of a coupled system of nonlinear differential equations, it is fast enough to be applicable to many of the investigation techniques relying on model atmospheres.
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