spectral type

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spectral type, 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

spectral type

A classification system for stars based on the strength of their spectral lines, using the letters O, B, A, F, G, K, M, L, and T to denote a range from blue (as in blue giant stars) to dim red (as in brown dwarfs). The spectrum of a star correlates with its surface temperature, ranging from over 60,000°K (O type) to less than 3,500°K (L and T types). See also Hertzsprung-Russell diagram.

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Achernar Aldebaran Algol Alpha Centauri system Altair Antares Arcturus astronomy Canopus Capella Deneb Denebola early-type star Fomalhaut Harvard classification Hertzsprung-Russell diagram late-star type Mizar Polaris			Antares is a red supergiant, spectral type Ml, located 550 light years away and about 700 times the diameter of the Sun. Double stars in Scorpius by Ferreira, Lucas / Monthly Notes of the Astronomical Society of Southern Africa The stars have been selected by Earth-based and HST observations as being broadly Sun-like in size and spectral type. NASA's Kepler joins the extrasolar planet hunt by McGee, Hazel / Journal of the British Astronomical Association 334 QB843 The workshops are held every 10 years, and this latest addressed such unanswered questions as the chemical evolution of the different spectral types of white dwarfs, and the excitation of pulsations. White dwarfs; proceedings by SciTech Book News			Spectant spectate Spectation spectator spectator pump spectator sport Spectatorial Spectatorship Spectatress specter Specter bat Specter candle Specter shrimp spectinomycin Spectioneer spectogram Spector Spector shrimp spectra spectral spectral color spectral colour Spectral lemur spectral line spectral luminous efficiency spectral type Spectrally spectre spectrin spectro- spectrobolometer spectrobolometry Spectroelectric spectrofluorimeter spectrogram spectrograph spectrographic spectrographic analysis spectrographically spectrography spectroheliogram spectroheliograph spectrohelioscope Spectrological spectrology spectrometer spectrometric spectrometry spectrophobia Spectrophone spectrophotometer			Spectral reflecance Spectral reflectance Spectral reflectance Spectral reflectance Spectral Reflectance Imaging Biosensor spectral regions Spectral Regression Discriminant Analysis Spectral Research & Technology, Inc. Spectral Resolution of a Function Spectral Resolution of a Linear Operator Spectral Resolution of a Random Function spectral response spectral response Spectral Sciences, Inc. spectral selective photoelectric effect spectral sensitivity spectral series Spectral shift Spectral shift Spectral Signal to Noise Ratio spectral temperature Spectral Term spectral theorems Spectral Theory of Diffraction Spectral Transform Decision Diagram spectral transmission spectral transmission factor spectral transmission factor spectral transmission factor Spectral Transmittance Curve spectral type spectral types spectral types Spectral Vegetation Index Spectral Warping Spectral Wave Prediction System Spectral width Spectral-Domain Method Spectral-Domain Moment Method Spectral-Encoded Code-Division Multiple Access Spectral-Null Code spectral-shift reactor SpectraLink Certified Messaging Application SpectraLink Voice Priority spectrality spectrality spectrally spectrally Spectrally Adaptive Light Filtering Spectrally Agile Sensor System Spectrally Optimized Smart Spectrally Resolved Four-Wave Mixing spectralness spectralness spectre spectre spectre spectre spectre Spectre (creature) Spectre (creature)

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