COOL SUBDWARF INVESTIGATIONS. III. DYNAMICAL MASSES OF LOW-METALLICITY SUBDWARFS
COOL SUBDWARF INVESTIGATIONS. III. DYNAMICAL MASSES OF LOW-METALLICITY SUBDWARFS
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DOI：
10.3847/0004-6256/152/6/153
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发表时间：
2016-07
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影响因子：
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通讯作者：
W. Jao;E. Nelan;T. Henry;O. Franz;L. Wasserman
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文献类型：
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作者：
W. Jao;E. Nelan;T. Henry;O. Franz;L. Wasserman
本文报道了利用哈勃空间望远镜上的精细制导传感器对先前已知的双线分光次矮星G 006-026 B和C的组分进行的动态质量测量。为了建立低金属丰度亚矮星的经验质光关系，我们收集了其他四个亚矮星系统的动力学质量，我们比较各种金属丰度的理论模型的质光关系。对于大多数恒星来说，它们落在模型预测它们是低金属量的区域。这项工作突出了亚矮星动力学质量的稀缺性，还有很多工作要做，以改善我们银河系中低质量亚矮星的质量误差和金属丰度测量。
We report dynamical mass measurements for the components of the previously known double-lined spectroscopic subdwarfs G 006-026 B and C using the Fine Guidance Sensors on the Hubble Space Telescope. To build the empirical mass–luminosity relation for low-metallicity subdwarfs, we collect four other subdwarf systems with dynamical masses that we compare to theoretical models for various metallicities on the mass–luminosity relation. For most stars, they fall in the regions where the models predict them to be low metallicity. This effort highlights the scarcity of dynamical masses for subdwarfs, and that much work remains to be done to improve the mass errors and metallicity measurements of low-mass subdwarfs in our Galaxy.