“UBV system”的概念、定义、翻译、参考文献-科学参考

单词	UBV system
释义	UBV system [¦yü´bē¦vē ´sis·tǝm] ^ASTRONOMY A system of stellar magnitudes in which an object's apparent magnitude is measured at three wavelengths, labeled U, at 360 nanometers; B, at 420 nanometers; and V, at 540 nanometers; and is characterized by the color indices B - V and U - B, which are both defined to be 0 for a star of spectral type A0. Also known as Johnson-Morgan system.
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