# Ao se construir um modelo de estrela a condic ao de

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Ao se construir um modelo de estrela, a condi¸c˜ ao de estabilidade (23.163) precisa ser verificada em cada camada do modelo, isto ´ e, o gradiente de press˜ao precisa ser computado usando-se a condi¸c˜ ao de equil´ ıbrio hidrost´a- tico (23.99), o gradiente de temperatura precisa ser calculado usando-se a equa¸c˜ ao do equil´ ıbrio radiativo (23.161), e seus valores inseridos na condi¸c˜ ao 349
se mover para cima, pelo princ´ ıpio de Arquimedes [Arquimedes de Siracusa ( 287-212 a.C.)]. Similarmente, um elemento que se desloque para baixo ser´a mais pesado do que o meio circundante e continuar´ a a se mover para baixo. Portanto, `a menor perturba¸c˜ ao, iniciam-se movimentos convectivos em uma camada inst´avel.

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