论文标题
基于光谱确定的大气参数的红色巨星的质量评估
Mass evaluation for red giant stars based on the spectroscopically determined atmospheric parameters
论文作者
论文摘要
可以从光谱确定的有效温度（t _eff）和金属度（[Fe/h]）以及亮度（L;源自视差）中评估恒星的质量（M），同时将它们与理论进化轨道的网格进行了比较。但是，人们认为，对于红色巨人的情况，这种基于轨道的质量（M_TRK）可能会被高估。同时，还有一种直接从表面重力（G），L和T_EFF评估质量（M_GLT）的替代方法。在开普勒领域，检查了大约100个基准巨头M_GLT的实际可靠性，该基准巨头已经确定了大气参数，并且可靠的质量（M_SEI）以及进化状态是从星际学学中知道的。此外，还对M_TRK的准确性进行了类似的检查以进行比较。事实证明，虽然M_GLT和M_SEIS之间看到合理的相关性，而不论出色的属性如何，但其精度却相当不足，因为log（m_glt/m_seis）在〜+/- 0.2-----0.3dex中相当广泛地分布。相反，发现M_TRK的可靠性取决于进化状态。尽管m_trk和m_seis彼此满意（典型的日志（m_trk}/m_seis）在〜+/- 0.1dex之内，对于h-burning的红色巨人以及燃烧的heburning heburning heburning的第二个质量的质量较高，m_trk倾向于以上的heas for heas for heas for heas for heas for a tex a formeis at tex at tex。质量较低的巨人。因此，M_GLT和M_TRK在其特征性优点和缺点方面相互互补。
The mass (M) of a star can be evaluated from its spectroscopically determined effective temperature (T _eff) and metallicity ([Fe/H]) along with the luminosity (L; derived from parallax), while comparing them with grids of theoretical evolutionary tracks. It has been argued, however, that such a track-based mass (M_trk) may tend to be overestimated for the case of red giants. Meanwhile, there is an alternative approach of evaluating mass (M_gLT) directly from surface gravity (g), L, and T_eff. The practical reliability of M_gLT was examined for ~100 benchmark giants in the Kepler field, for which atmospheric parameters are already determined and the reliable mass (M_seis) along with the evolutionary status are known from asteroseismology. In addition, similar check was also made for the accuracy of M_trk for comparison. It turned out that, while a reasonable correlation is seen between M_gLT and M_seis almost irrespective of the stellar property, its precision is rather insufficient because log(M_gLT/M_seis) distributes rather widely within ~+/-0.2--0.3dex. In contrast, the reliability of M_trk was found to depend on the evolutionary status. Although M_trk and M_seis are satisfactorily consistent with each other (typical dispersion of log(M_trk}/M_seis) is within ~+/-0.1dex) for H-burning red giants as well as He-burning 2nd clump giants of higher mass, M_trk tends to be considerably overestimated as compared to M_seis by up to ~<0.4~dex for He-burning 1st clump giants of lower mass. Accordingly, M_gLT and M_trk are complementary with each other in terms of their characteristic merit and demerit.
