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> The Hertzsprung-Russell diagram

The Hertzsprung-Russell diagram

author: P.Carril/Novapix

reference: a-eto99-99002

Image Size 300 DPI: 17 * 17 cm

The Hertzsprung-Russell diagram is named after the Danish astronomer Einar Hertzsprung (1873-1967) and the American astronomer Henry Norris Russell (1877 - 1957). At the beginning of the 20th century they independently noticed that red stars come in very different sizes, pioneering subsequent studies of stellar parameters (e.g., temperature, size and mass). In its basic version, this diagram plots stellar temperature (or colour) against brightness (or magnitude) and is therefore also referred to as the "colour-magnitude diagram". The position of a particular star in the diagram also provides information about its evolutionary stage (and age).

Keywords for this photo:

A STAR - ASTRONOMY - B STAR - BLUE GIANT - BLUE STAR - COMPARISON - F STAR - G STAR - H-R DIAGRAM - HERTZSPRUNG EJNAR - HERTZSPRUNG-RUSSELL DIAGRAM - ILLUSTRATION - K STAR - M STAR - MASSIVE STAR - O STAR - RED DWARF - RED GIANT - RUSSELL HENRY NORRIS - SIZE - SPECTRUM - STAR - SUN - SUPERGIANT - TEMPERATURE - WHITE DWARF - YOUNG STAR -