spectral type

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spectral type


spectral class

(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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

spec′tral type′

a category for classifying a star according to features of its spectrum that indicate its surface temperature and chemical composition.
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References in periodicals archive ?
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.
Chesterton (circa-1900 writer) to Robert Osserman (modern mathematician) to Einstein to Richard Feynman to John Wheeler to Annie Jump Cannon (early 20th-century pioneer in stellar classification).
The L spectral type follows M in the stellar spectral sequence and represents the first addition to the stellar classification scheme in more than 50 years (S&T: November 1998, page 26).