论文标题
Lamost DR8低分辨率AFGK星的初步统计分析
The preliminary statistical analysis of LAMOST DR8 low resolution AFGK stars
论文作者
论文摘要
我们下载了Lamost DR8低分辨率目录6,478,063 AFGK TPYE恒星，并绘制有效温度，引力加速度和金属丰度的数字。一些中小型质量恒星从前序列或主序列阶段演变为行星星云阶段或白色矮人阶段，恒星进化代码\ texttt {mesa}。我们分析观察到的统计数据和模型计算结果，然后初步获得一些基本结论。 log $ g $少于0.85的大多数红色巨型和渐近巨星的金属丰度差。大多数型号的主要序列星是金属富明星，其log $ g $从3.5到4.5。结论在特定误差范围内是合理的。统计数据反映了中等质量星的H-R图中的间隙区域的理论。中心核氢燃烧阶段和中央核心氦燃烧阶段分别对应于重力加速度统计数字中的峰结构。 A，F，G和K型恒星之间的金属丰度具有广泛的分布。在进行精美的研究工作时，我们不能简单地用太阳的金属丰度代替这些恒星的金属丰度。
We download the LAMOST DR8 low resolution catalog 6,478,063 AFGK tpye stars and plot the figures of effective temperature, gravitational acceleration, and metal abundance. Some small and medium mass stars are evolved from pre-main sequence or main sequence stage to planetary nebula stage or white dwarf stage by the stellar evolution code \texttt{MESA}. We analyze the observed statistical data and model calculation results, and then obtain some basic conclusions preliminarily. Most red giant and asymptotic giant stars with log$g$ less than 0.85 have poor metal abundance. Most hot A type main-sequence stars are metal rich stars with log$g$ from 3.5 to 4.5. The conclusions are reasonable within a certain error range. The theory of a gap area in the H-R diagram for stellar evolutions of medium mass stars is reflected in the statistical figures. The central core hydrogen burning stage and the central core helium burning stage correspond to the peak structures in the gravitational acceleration statistical figures respectively. The metal abundances among A, F, G, and K type stars have a wide distribution. We can not simply replace the metal abundances of these stars with the metal abundance of the Sun when doing a fine research work.
