Cepheid variable
Cepheid variable One of an important class of variable stars that pulsate in a regular manner, accompanied by changes in luminosity. Cepheids can expand and contract up to 30% in each cycle. The average luminosity is 10,000 times that of the Sun. Cepheids became important in cosmology (1912) when US astronomer Henrietta Leavitt discovered a relationship between the period of light variation and the absolute magnitude of a cepheid. This period-luminosity law enables the distances of stars to be ascertained.
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Ejnar Hertzsprung , Hertzsprung, Ejnar
Hertzsprung, Ejnar
astronomy.
Hertzprung’s father, Severin Hertzsprung, had a graduate degree in astronomy from the University of… Variable Star , Variable stars are stars that vary in brightness over time. In most cases, these changes occur very slowly over a period of months or even years. In… Henrietta Leavitt , Henrietta Swan Leavitt
Henrietta Swan Leavitt
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Herschel, William
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Bessel, Friedrich Wilhelm
astronomy, geodesy, mathematics.
Bessel’s father was a civil servant in Minden; his mother was th… Hertzsprung-russell Diagram , Hertzsprung-Russell Diagram
A Hertzsprung-Russell diagram, or HR diagram, is a graph of stellar temperatures (plotted on the horizontal axis) and lum…
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Cepheid variables
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Cepheid variables