Cepheid light curve, illustration

Código da imagem : C040/4606
Dimensões : 5.246 X 3.331 pixels
Orientação : horizontal
Data da foto: 03/10/2018
Tamanho máximo não comprimido : 50,0MB
Pauta: Cepheid light curve, illustration
Título: Cepheid light curve, illustration
Descrição: Diagram showing the variation of a Cepheid variable over time with strict periodicity. Cepheids are pulsating variable stars, whose spectral type and luminosity class (and therefore their brightness and size) vary over a few days to months. The prototype is Delta Cephei. As they grow larger, they cool down and get redder, while their brightness drops. The green curve shows the variation in radius; the red, the change in brightness. The orange dashes indicate the period. They fall into two main classes. Type I Cepheids are bright yellow giants and supergiants, thousands of times more luminous than the Sun and several times more massive. They vary their radius by as much as 25 per cent. Type II Cepheids are much less massive, around half that of the Sun. The variations of many Cepheids, such as the prototype, can easily be seen with the naked eye ever a period of days or weeks.
Coleção: Science Photo Library
Crédito: MARK GARLICK/SCIENCE PHOTO LIBRARY/ Fotoarena
Disponibilidade: imediata
Direito de uso: Direito controlado
Autorização do(a) modelo: não
Autorização da propriedade: não

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