Variable of the type W Virginis
A variable of type W Virginis is a variable star similar to a Céphéide. However, the use of the formula of Céphéides to calculate their distance will lead to a too low value, an error which Edwin Hubble made by observing M31.
The stars of the type W Virginis differ from Céphéides because they are stars of population II which have weaker Métallicité than our Sun. Their luminosity is, on average, weaker than that of true Céphéides (approximately 1,5 magnitudes). Their period lies between 1 and 60 days.
They are also called Céphéides of the type II .
References
- SEDS: Variable Stars
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