The second type are also known as W Virginis stars. Ionization of helium just below their photosphere results in increased opacity in the kappa mechanism.
The second type are also known as W Virginis stars. Ionization of helium just below their photosphere results in increased opacity in the kappa mechanism. They reside in a namesake instability strip on the HR diagram and are named for the Delta one discovered by John Goodricke. The main star in Polaris is one of these stars, which show a period-luminosity relationship discovered by Henrietta Leavitt. Used as standard candles for nearby galaxies, FTP, name these pulsating stars.
The second type are also known as W Virginis stars. Ionization of helium just below their photosphere results in increased opacity in the kappa mechanism.
{Cepheid variable}s