spectral type

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Related to Stellar classification: Spectral class

spectral type

or

spectral class

n
(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 temperature

spec′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]
References in periodicals archive ?
At the observatory, she read "the rune-like lines of the spectra," Sobel writes, noticing patterns that led to the first iteration in 1890 of the Draper stellar classification system.
2--What stellar classification tells us, which introduces the Hertzsprung-Russell diagram; 3--The dawn of a new era, where the atomic quantum theory first gains prominence; 4--Towards a complete theory of stellar structure, where we learn that at one time it was thought dwarf stars were liquid and only the giants were gaseous; 5--From chemistry to dying stars; why are there so many elements?
A complete discussion of the properties of uvbyβ photometry and its use for stellar classification was given in Stromgren's most cited article (Stromgren 1966; Olsen 1994).
By 1901, the year Cannon published her first catalog of stellar spectra, astronomers were using nearly two-dozen stellar classification schemes.
Just across the border in Ara, Alpha Arae has the same stellar classification, and both stars have luminosities approximately 2,000 times greater than that of our Sun.
Both volumes conclude with identical series of brief appendices covering astronomical coordinates, magnitudes, stellar classification and colors, nebula filters, and a very spotty list of astronomical resources.