Mira变星拱星包层的温度结构

我们研究了Mira变星拱星包层的温度结构。假设Mira变星拱星包层由气体和尘埃颗粒两种成分组成,气体为理想气体,并有稳定的和球对称的径向向外流动;我们研究了拱星包层气体的加热机制和致冷原因,根据拱星包层气体的质量、动量和能量守恒方程及多方膨胀过程方程,通过计算得到了拱星包层气体温度所满足的温度方程。这个温度方程对于Mira变星拱星包层有普遍意义。对于典型的Mira变星我们进行了数值计算,得到了温度曲线。与观测得到的温度曲线比较表明,理论模型与观测事实相一致。

The Temperature Structure of the Circumstellar Envelopes of Mira Variables

The temperature structure of the circumstellar envelopes of Mira variables is studied. It is supposed that the envelopes consist of gas and dust grain. The gas is ideal gas. The envelopes have steady and spherical radial out-flow. According to conservation equations of mass, momentum and energy, and equation of polytropic expanding process, we studied heating and cooling mechanism of gas and found the equation of the gas temperature of the envelopes. This equation of gas temperature is of universal significance for the envelopes. For typical Mira variables we made numerical calculations and obtained a temperature curve. Comparing with observed temperature curve it is shown that our theoretical model is consistent with the observational facts.