spectral classification - Hutchinson encyclopedia article about spectral classification

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spectral classification

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spectral classification

In astronomy, classification of stars according to their surface temperature and luminosity, as determined from their spectra. Stars are assigned a spectral type (or class) denoted by the letters O, B, A, F, G, K, and M, where O stars (about 40,000 K/39,700°C/71,500°F) are the hottest and M stars (about 3,000 K/2,700°C/5,000°F) are the coolest.

Each letter may be further divided into ten subtypes, B0, B1, B2, and so on. Stars are also assigned a luminosity class denoted by a Roman numeral attached to the spectral type: I (supergiants), II (bright giants), III (giants), IV (subgiants), V (main sequence), VI (subdwarfs), or VII (white dwarfs). The Sun is classified as type G2V. See also Hertzsprung-Russell diagram.

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colour index Fleming, Williamina Paton Stevens Russell, Henry Norris Strömgren, Bengt Georg Daniel			This approach, based on watershed, is composed of a spectral classification to obtain the markers and a vectorial gradient which gives the spatial information. Morphological segmentation of hyperspectral images by Noyel, Guillaume; Angulo, Jesus; Jeulin, Dominique / Image Analysis and Stereology The objective of the project was to determine minimum masses and individual spectral classifications for the two stars in HD100213. Topographic Separation of the Binary Spectra for HD 100213 Tumus by Outz, Cynthia L.; Penny, Lara / Bulletin of the South Carolina Academy of Science The group's 17th session gets under way at Burbage Visitor Centre on Tuesday, September 5, with a presentation by David Conner, of Leicester Astronomical Society, on the spectral classification of stars. Speaker aiming for stars by Coventry Evening Telegraph (England)			speaker keys Speaker, Tris speaking speaking-length Spearfish Spearman's rank spearmint Spears, Britney Spears, Steve J Special Air Service special drawing right special education Special Operations Executive special relationship specialization speciation species specific gravity specific heat capacity specific latent heat specification speckle interferometry spectacles spectator ion Spector, Phil spectral classification spectral line Spectre's Bride, The spectrometer spectrometry spectroscopic binary spectroscopy spectrum speculative action speculator speculum Spedding, James Spee, Maximilian Johannes Maria Hubert speech chip speech disorder speech recognition speech recognition software speech synthesis speech therapy speech-song speed speed - time graph speed of light speed of reaction speed of sound speed records			Spectral Analysis and Recognition Computer Spectral Analysis Facility Spectral Analysis Laboratory Spectral Analysis of Heart Rate Variability Spectral Analysis of Linear Operators Spectral Analysis of Speech Sounds Spectral Analysis of Surface Waves Spectral Analysis of the Ultrasound Doppler's Signal Spectral and In-Band Radiometric Imaging of Targets and Scenes Spectral and Photometric Imaging Receiver Spectral Angle Mapper spectral approximation Spectral Autocorrelation Peak Valley Ratio Spectral band Spectral band emission Spectral band replication Spectral band replication Spectral bands Spectral bands spectral bandwidth Spectral Bat Spectral centroid Spectral Change Vector Analysis spectral characteristic Spectral class Spectral class Spectral classes Spectral classes spectral classification Spectral Classification of Stars Spectral Classified Vector Quantization spectral color spectral color spectral colour spectral colour Spectral Comparator Facility Spectral Concentration Spectral Data Spectral Data Base System Spectral decomposition Spectral density spectral dimension spectral directional reflectance factor Spectral Domain Analysis Spectral Domain Full-Wave Analysis Spectral Domain Integral Equation Spectral Domain Optical Coherence Tomography spectral Doppler ultrasound Spectral Dyadic Green's Function Spectral edge frequency Spectral Edge Frequency 95 Percentile Spectral efficiency Spectral element method Spectral Element Ocean Model Spectral emissions Spectral emissions

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