| 释义 |
spectral type
spectral type or spectral classn (Astronomy) any of various groups into which stars are classified according to characteristic spectral lines and bands. The most important classification (Harvard classification) has a series of classes O, B, A, F, G, K, M, the series also being a scale of diminishing surface temperaturespec′tral type′
n. a category for classifying a star according to features of its spectrum that indicate its surface temperature and chemical composition. [1920–25] spectral type
spectral type[′spek·trəl ‚tīp] (astronomy) A label used to indicate the physical and chemical characteristics of a star as indicated by study of the star's spectra; for example, the stars in the spectral type known as class B are blue-white, and are referred to as helium stars because the dominant lines in their spectra are the lines in helium spectra. |