Variável W Virginis
W Virginis são uma classe de estrelas variáveis semelhante às estrelas Cefeidas.[1] No entanto, usando a fórmula para as W Virginis variáveis para calcular a distância de uma cefeida, irá produzir um valor muito pequeno, um equívoco que Edwin Hubble fez enquanto observava a M31.
Estrelas W Virginis diferem das Cefeidas porque são estrelas de População II e assim ter uma metalicidade menor do que nosso sol. Sua luminosidade é, em média, menor que a das Cefeidas clássicas, por volta de 1,5 de magnitude absoluta. O período varia entre 10 e 20 dias.[1]
Referências
- ↑ a b Wallerstein, George (1 de julho de 2002). «The Cepheids of Population II and Related Stars». Publications of the Astronomical Society of the Pacific. 114: 689–699. ISSN 0004-6280. doi:10.1086/341698
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