论文标题
基于银河系的红色巨型分支方法的多波长，光学（VI）和近红外（JHK）校准
Multi-Wavelength, Optical (VI) and Near-Infrared (JHK) Calibration of the Tip of the Red Giant Branch Method based on Milky Way Globular Clusters
论文作者
论文摘要
使用高精度地面的光度法，用于46个低降红色的银河球状球状簇，结合GAIA DR2适当的运动选择，我们在两个光学（$ vi $）和三个近范围（$ jhk $）波长的情况下校准了红色巨型分支（TRGB）方法的零点。在此过程中，我们利用了这些簇的明显定义的零年龄水平分支（ZAHB），将我们的群集样品相对校准了跨越多种金属率的复合颜色磁性图，然后使用该复合材料的绝对零点使用几何形状的依赖的几何形式脱落的ecrips eclinactripripripriprips eclince ciarlips eclince edached eclinace cerlips eclipsrips eclips eclips of clister of clister $ clem $ CELLUSE $ CENTUSTER $ CENMAURI。我们测量的$ i- $ band零点[$ m_i = -4.056 \ pm 0.02 \ text {（stat}）\ pm 0.10 \ pm 0.10 \ text {（sys）} $]同意在先前发表的两个独立校准的一个sigma中，使用lmc [$ m_i = $ -4.047 MAG中的trgb stars in trgb stars in trgb start Freedman等。 2019，2020]和Maser Galaxy NGC 4258 [$ M_ {F814W} = $ -4.051 MAG; Jang等。 2020]。我们还为我们的$ j，h，k $零积分找到了几项文献研究的密切协议。
Using high precision ground-based photometry for 46 low-reddening Galactic globular clusters, in conjunction with Gaia DR2 proper motions for member star selection, we have calibrated the zero point of the tip of the red giant branch (TRGB) method at two optical ($VI$) and three near-infrared ($JHK$) wavelengths. In doing so, we utilized the sharply-defined zero-age horizontal branch (ZAHB) of these clusters to relatively calibrate our cluster sample into a composite color-magnitude diagram spanning a wide range of metallicities, before setting the absolute zero point of this composite using the geometric detached eclipsing binary distance to the cluster $ω$ Centauri. The $I-$band zero point we measure [$M_I = -4.056 \pm 0.02 \text{ (stat}) \pm 0.10 \text{ (sys)} $] agrees to within one sigma of the two previously published independent calibrations, using TRGB stars in the LMC [$M_I = $ -4.047 mag; Freedman et al. 2019, 2020] and in the maser galaxy NGC 4258 [$M_{F814W} = $ -4.051 mag; Jang et al. 2020]. We also find close agreement for our $J,H,K$ zero points to several literature studies.
