英语词汇“Harvard classification”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

Harvard classification

/ˈhɑːvəd

noun Astronomy

A system of classification of stars based on their spectral types, the chief classes (O, B, A, F, G, K, M) forming a series from very hot bluish-white stars to cool dull red stars.Stars are given a Harvard classification according to the dominant element found in their spectra and the classes are ordered according to their surface temperature....

This classification is based on spectral lines sensitive to stellar surface gravity which is related to luminosity, as opposed to the Harvard classification which is based on surface temperature.
In 1910 Annie Jump Cannon, working under the direction of Pickering, modified the Harvard classification system taking all of the absorption lines into account.

Origin

1960s: named after the observatory at Harvard University, where it was devised.

单词	Harvard classification
释义	Harvard classification /ˈhɑːvəd / noun Astronomy A system of classification of stars based on their spectral types, the chief classes (O, B, A, F, G, K, M) forming a series from very hot bluish-white stars to cool dull red stars.Stars are given a Harvard classification according to the dominant element found in their spectra and the classes are ordered according to their surface temperature.... This classification is based on spectral lines sensitive to stellar surface gravity which is related to luminosity, as opposed to the Harvard classification which is based on surface temperature. In 1910 Annie Jump Cannon, working under the direction of Pickering, modified the Harvard classification system taking all of the absorption lines into account. Origin 1960s: named after the observatory at Harvard University, where it was devised.
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