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色指数[Color Index] [2005-9-15]
iamet 发表在 ¤〖天文〗
| The color of a star is measured as the log of the ratio of color magnitudes at different wavelengths (or through different filters). The standard filters are ultraviolet (320 nm-390 nm), blue (390 nm-480 nm) and visual (510 nm-590 nm), denoted U, B, and V respectively. The U-B color, for instance, is
The star Vega is defined as an A0 star, and is the standard for
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学好数理化，走遍天下都不怕！ | |
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