论文标题
jagb方法的银河系零点校准：在银河开放簇中使用热脉冲AGB恒星
Milky Way Zero-Point Calibration of the JAGB Method: Using Thermally Pulsing AGB Stars in Galactic Open Clusters
论文作者
论文摘要
我们提出了基于热脉冲AGB星的JAGB方法的J波段绝对大小的新校准，该恒星是Marigo等人（2022年）独立编译和发行的银河系开放式簇的成员，具有距离和红色。其中17个具有光度化选择的J-Branch AGB星星给出M_J = -6.40 MAG，散布+/- 0.40 mag，而平均值为+/- 0.10 mag。结合了Lee等人的银河系碳星校准。 （2021）通过此确定，加权平均值为M_J（MW）= -6.19 +/- 0.04 mag（平均值上的错误）。该值在统计上与LMC和SMC中该距离指标群体确定的价值没有区别，这进一步证明JAGB恒星是高光度和普遍适用性的极其可靠的距离指标。将JAGB星的零点组合在这三个系统中，M_J = -6.20 +/- 0.01（stat）+/- 0.04（sys）MAG成为我们对JAGB零点及其相关错误的最佳当前估计。最后，我们注意到，没有发现该零点对金属性的任何统计学上显着依赖性的证据。
We present a new calibration of the J-band absolute magnitude of the JAGB method based on thermally pulsing AGB stars that are members of Milky Way open clusters, having distances and reddenings, independently compiled and published by Marigo et al (2022). 17 of these photometrically-selected J-Branch AGB stars give M_J = -6.40 mag with a scatter of +/-0.40 mag, and a sigma on the mean of +/-0.10 mag. Combining the Milky Way field carbon star calibration of Lee et al. (2021) with this determination gives a weighted average of M_J(MW) = -6.19 +/- 0.04 mag (error on the mean). This value is statistically indistinguishable from the value determined for this population of distance indicators in the LMC and SMC, giving further evidence that JAGB stars are extremely reliable distance indicators of high luminosity and universal applicability. Combining the zero points for JAGB stars in these three systems, a value of M_J = -6.20 +/- 0.01 (stat) +/- 0.04 (sys) mag becomes our best current estimate of the JAGB zero point and its associated errors. Finally, we note that no evidence is found for any statistically significant dependence of this zero point on metallicity.
