We derive transformation equations between GALEX and UBV colours by using the reliable data of 556 stars. We present two sets of equations: as a function of (only) luminosity class and as a function of both luminosity class and metallicity. The metallicities are provided from the literature, while the luminosity classes are determined by using the PARSEC mass tracks in this study. Small colour residuals and high squared correlation coefficients promise accurate derived colours. The application of the transformation equations to 70 stars with reliable data shows that the metallicity plays an important role in estimation of more accurate colours.

中文翻译：

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桥接紫外和光学区域：GALEX 和 UBV 光度系统之间的转换方程

我们推导出之间的变换方程GALEX和UBV通过使用 556 颗星的可靠数据来着色。我们提出了两组方程：作为（仅）光度等级的函数，以及作为光度等级和金属度的函数。金属丰度是从文献中提供的，而光度等级是通过使用本研究中的 PARSEC 质量轨迹确定的。小的颜色残差和高平方相关系数保证了准确的派生颜色。将变换方程应用于具有可靠数据的 70 颗恒星表明，金属丰度在估计更准确的颜色方面起着重要作用。