直径与温度VII：利用CHARA阵列对类太阳恒星的高角分辨率测量
Diameters and Temperatures VII: High-angular resolution measurements of Solar-type stars with the CHARA Array
另 4 家 · 查看机构详情
- Louisiana State University（路易斯安那州立大学）
- Lowell Observatory（洛厄尔天文台）
- Georgia State University（佐治亚州立大学）
- University of Sydney（悉尼大学）
- University of Hawaii（夏威夷大学）
- Australian National University（澳大利亚国立大学）
- University of Rochester（罗切斯特大学）
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中文总结 AI 辅助
研究利用CHARA阵列的PAVO组合器测量27颗类太阳恒星的角直径，结合多数据得出恒星参数，为相关研究提供经验基准。
中文摘要 AI 辅助
我们利用CHARA阵列的精密天文可见光观测（PAVO）光束组合器，对27颗近邻类太阳恒星进行了角直径的干涉测量。该样本涵盖了宽范围的金属丰度，包含多个已知系外行星宿主星，覆盖从零龄主序到轻度演化亚巨星的演化阶段。我们对每个目标测量了均匀盘和临边昏暗角直径，并结合热光度和盖亚（Gaia）视差，确定了精确的、与模型无关的恒星半径、有效温度和光度。我们实现了半径约1%、有效温度约1.5%的典型不确定度。与多个恒星演化模型网格的比较得出了质量和年龄估计，并能评估网格间的系统误差，凸显了对丰度、演化阶段及与网格边界接近程度的敏感性。我们的结果为检验恒星演化理论、完善表面亮度-颜色关系以及改进系外行星宿主星的表征提供了经验基准。
英文摘要
We present interferometric measurements of angular diameters for 27 nearby solar-type stars obtained with the Precision Astronomical Visible Observations (PAVO) beam combiner at the CHARA Array. The sample spans a broad range of metallicities, includes several known exoplanet hosts, and covers evolutionary stages from the zero-age main sequence to mildly evolved subgiants. Uniform-disk and limb-darkened angular diameters were measured for each target and combined with bolometric fluxes and Gaia parallaxes to determine precise, model-independent stellar radii, effective temperatures, and luminosities. We achieve typical uncertainties of $\sim1$\% in radius and $\sim1.5$\% in effective temperature. Comparisons with multiple stellar evolutionary model grids yield mass and age estimates and enable assessment of grid-to-grid systematics, highlighting sensitivities to abundances, evolutionary stage, and proximity to grid boundaries. Our results provide empirical benchmarks for testing stellar evolutionary theory, refining surface brightness-color relations, and improving the characterization of exoplanet host stars.
