2005/09/15 | 色指数[Color Index]
类别(¤〖天文〗) | 评论(0) | 阅读(32) | 发表于 20:18
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

0

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