Definition of Harvard classification in English:
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 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.
1960s: named after the observatory at Harvard University, where it was devised.
Definition of Harvard classification in:
- British & World English dictionary
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.
Most popular in the US
Most popular in Australia
Most popular in Malaysia
Most popular in Pakistan