标题： F-G超巨星中基于$uvbyβ$光度学的$T_{\rm {eff}}$和log~$g$的函数关系 显示英文标题

标题： Functional relationships for $T_{\rm {eff}}$ and log~$g$ in F-G supergiants from $uvbyβ$ photometry

摘要： 利用50颗F-G超巨星的光电$uvby\beta$数据以及近期精确的合成和光谱测定的$T_{\rm eff}$和log~$g$值，我们计算出了函数关系式，从而得到了这些类型恒星的有效温度和重力的初步估算值。 结果表明，尽管$T_{\rm eff}$的关系式是基于年轻大质量超巨星的数据计算得出的，但它们同样适用于类似温度的演化恒星，如后AGB星和RV Tau星。 此外，重力也可以从$\Delta [c_1]$指数预测出来，其不确定性约为0.26 dex。 尽管可以看到$M_V$和$\Delta [c_1]$之间存在明显且显著的趋势，但未发现能够预测准确的$M_V$值的校准方法。 显示英文摘要

摘要： From photoelectric $uvby\beta$ data and recent accurate synthetic and spectroscopic values of $T_{\rm eff}$ and log~$g$ for 50 F-G supergiants, we have calculated functional relationships that lead to initial estimates of effective temperature and gravities for these types of stars. It is shown that while the $T_{\rm eff}$ relationships are calculated using the data on young massive supergiants, they are also valid for evolved stars of similar temperatures like post-AGB and RV Tau stars. The gravity can also be predicted from the $\Delta [c_1]$ index with an uncertainty of about 0.26 dex. Although a clear and significant trend between $M_V$ and $\Delta [c_1]$ is seen, no calibration is found that predicts accurate values of $M_V$.