CHARA阵25颗K巨星的角直径和有效温度
Angular Diameters and Effective Temperatures of Twenty-five K Giant Stars from the CHARA Array
摘要：
使用佐治亚州立大学的CHARA阵列干涉仪，我们测量了25颗巨星的角直径，其中6颗拥有系外行星。这些测量和依巴谷曲率的组合产生样品的物理线性半径。除了两个异常值，我们的值匹配的角直径和物理半径估计使用光度方法内的相关误差的优势，我们的不确定性显着降低。我们还利用新测量的直径计算了恒星的有效温度。我们的值也不匹配那些来自光谱观测的值，也许是由于所使用的方法的固有特性，或者是因为恒星模型中缺少会影响光谱温度的消光源。
英文摘要：
Using Georgia State University's CHARA Array interferometer, we measured angular diameters for 25 giant stars, six of which host exoplanets. The combination of these measurements and Hipparcos parallaxes produce physical linear radii for the sample. Except for two outliers, our values match angular diameters and physical radii estimated using photometric methods to within the associated errors with the advantage that our uncertainties are significantly lower. We also calculated the effective temperatures for the stars using the newly-measured diameters. Our values do not match those derived from spectroscopic observations as well, perhaps due to the inherent properties of the methods used or because of a missing source of extinction in the stellar models that would affect the spectroscopic temperatures.
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