This is a K-type main sequence star with a spectral classification of K0 V . It has about 79 % of the excess of infrared radiation at a wavelength of 70 ?m.
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In 1885, Edward C . Pickering undertook an ambitious program of stellar spectral classification at Harvard College Observatory, in which a team of Harvard Classification Scheme which was accepted for worldwide use in 1922.
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This variable star changes in apparent magnitude from 4.90 to 4.20 magnitude with a period of 7.01 days . Its change in brightness is accompanied by a change in spectral classification, from G2 to F5.
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When the absolute magnitude for a group of stars is plotted against the spectral classification of the star, in a Hertzsprung Russell diagram, evolutionary patterns are found that relate to the mass, age and composition of the star.
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10 Lacertae was one of the first O-type stars ( along with S Monocerotis ) to be defined as an anchor point for the MKK spectral classification; since the early twentieth century it has served as such a point.
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The spectral classification is as a G0 yellow supergiant, but in other respects it appears to be a giant star . or G0Ib-IIa Ca1, where the abundance suffixes indicate stronger Calcium lines than expected for the class or weaker hydrocarbons.
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The brighter component is a giant star with a spectral classification of G8 III and an apparent magnitude of 4.79 . The effective temperature of its outer atmosphere is 4, 900 K, giving it the yellowish glow of a G-type star.
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Modern atmospheric models can accurately match all the spectral line strengths and profiles to give a spectral classification, or even skip straight to the physical parameters of the star, but in practice luminosity classes are still usually assigned by comparison against standard stars.
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I think the number ( in this case 1 ) relates to the absolute magnitude and V is the Yerkes spectral classification, all of which are explained in the article I cited . talk ) 15 : 43, 9 December 2008 ( UTC)
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The minor planet was named in memory of Danish chemist and astronomer Ejnar Hertzsprung ( 1873 1967 ), best known for the famous Hertzsprung Russell diagram, a spectral classification system for stars he developed jointly with Russel, after whom the asteroid 1762 Russell was named.
