Sergei Alexandrovich Zhevakin
Encyclopedia
Sergei Alexandrovich Zhevakin (April 11, 1916 – February 21, 2001) was a Russian
astronomer
.
Zhevakin is credited for identifying ionized helium as the valve for the heat engine that drives the pulsation of Cepheid variable
stars.
Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...
astronomer
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
.
Zhevakin is credited for identifying ionized helium as the valve for the heat engine that drives the pulsation of Cepheid variable
Cepheid variable
A Cepheid is a member of a class of very luminous variable stars. The strong direct relationship between a Cepheid variable's luminosity and pulsation period, secures for Cepheids their status as important standard candles for establishing the Galactic and extragalactic distance scales.Cepheid...
stars.