arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.11044astro-ph.SR
收藏

FGK主序星质量-光度和半径-光度关系的再研究

Revisiting the mass- and radius-luminosity relations for FGK main-sequence stars

João Fernandes, Ricardo Gafeira, Johannes Andersen

摘要:

标度关系是估计未知恒星量的非常有用的工具。在这个框架内,食双星是这个目标的理想选择,因为它们的质量和半径是已知的,具有非常好的精度,从而改善了对模型的约束。我们的目标是提供经验关系的质量和半径的函数光度,金属丰度,和年龄。我们调查,特别是金属丰度和年龄对这些关系的影响。我们使用了基于DEBCat数据的多维拟合方法,DEBCat是一个更新的食双星观测目录,如质量,半径,光度,有效温度,重力和金属丰度。我们使用{PARAM网络界面进行恒星参数的贝叶斯估计,以及}恒星进化代码MESA来估计双星年龄,假设两个成员都是同时代的假设。我们用56颗恒星(金属丰度和质量在-0.34<[Fe/H]<0.27和0.66<M/M{_ \odot }<1.8之间)导出了质量和半径-光度-金属丰度-年龄关系。与文献中的结果一致,实验结果与实验结果吻合较好,其质量和半径的精度分别为3.5%和5.9%。我们的结论是,包括年龄在这种关系中增加了质量的适合,特别是在质量方面,相比半径。另一方面,正如其他作者所指出的,我们观察到质量关系的色散比半径关系的色散高。我们认为这是由于恒星年龄效应。

英文摘要:

Scaling relations are very useful tools for estimating unknown stellar quantities. Within this framework, eclipsing binaries are ideal for this goal because their mass and radius are known with a very good level of accuracy, leading to improved constraints on the models. We aim to provide empirical relations for the mass and radius as function of luminosity, metallicity, and age. We investigate, in particular, the impact of metallicity and age on those relations. We used a multi-dimensional fit approach based on the data from DEBCat, an updated catalogue of eclipsing binary observations such as mass, radius, luminosity, effective temperature, gravity, and metallicity. We used the {PARAM web interface for the Bayesian estimation of stellar parameters, along with} the stellar evolutionary code MESA to estimate the binary age, assuming a coeval hypothesis for both members. We derived the mass and radius-luminosity-metallicity-age relations using 56 stars, {with metallicity and mass in the range -0.34<[Fe/H]<0.27 and 0.66<M/M{_\odot}<1.8}. With that, the observed mass and radius are reproduced with an accuracy of 3.5% and 5.9%, respectively, which is consistent with the other results in literature. We conclude that including the age in such relations increases the quality of the fit, particularly in terms of the mass, as compared to the radius. On the other hand, as other authors have noted, we observed an higher dispersion on the mass relation than in that of the radius. We propose that this is due to a stellar age effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑