For a group of stars with the same temperature, the luminosity class differentiates between their sizes (supergiants, giants, main-sequence stars, and subdwarfs). Spectra are described by Kirchoff's Laws: A hot opaque body, such as a hot, dense gas (or a solid) produces a continuous spectrum – a complete rainbow of colors. The standard spectral class classification scheme is thus based on temperature. recent discoveries have led to tentative new classifications for even cooler L-class stars. Spectral Class of Stars. Organization in science is a must. Most stars are grouped into a small number of spectral types. They basically tell you how much light is produced at each color. In the Yerkes classification scheme, stars are assigned to groups according to the width of their spectral lines. When trying to classify, scientists call this the study of classification or taxonomy. And one of these classifications is called the spectral class. Classification of spectral types.

Astronomers are very interested in spectra – graphs of intensity versus wavelength for an object. Spectral Classification of Stars. Most stars fit into one of the following types or spectral classes: O, B, A, F, G, K, M. These classes go from hot to cool with O the hottest and M, cool.

Types of Spectra. Stellar Spectral Types Stars can be classified by their surface temperatures as determined from Wien's Displacement Law, but this poses practical difficulties for distant stars. Well, in terms of astronomy, there is also organization.

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