| 单词 | uvby system |
| 释义 | uvby systemuvby system(yoo-vee-bee-wÿ ) A system of photometry, devised by B. Strömgren, in which photoelectric magnitudes u , v , b , and y are measured at four wavelength bands: measurements of u (ultraviolet) are centered on 350 nm, v (violet) on 410 nm, b (blue) on 470 nm, and y (yellow) on 550 nm. The bandwidth (20–30 nm) is much narrower than for the UBV system. The uvby system can be used to measure metallicity, temperature, and Balmer discontinuity of A, B, and F stars.uvby system[′yüv·bē ‚sis·təm] |
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