Download - AGA 0100 - edisciplinas.usp.br
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AGA 0100
7.1 Classificação espectral: a temperatura das
estrelas
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Espectroscopia
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• Tipos de espectros:
A descoberta do Hélio
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Lei de Wien: λmax = 3 x 106/T(K) nm
T(K) = 3 x 106/λmax
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A partir dos espectros podemos
determinar as abundâncias dos
elementos químicos
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Sequência de temperatura:
O B A F G K M
O Be A Fine Girl (Guy) Kiss Me
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Subclasses de temperatura
• Cada classe principal tem 10 divisões:
B0, B1, B2.....B9
B0 é mais quente e B9, a mais fria
• Mais tarde se subdividiu ainda mais:
F3.5 ou M4.5
• O Sol é uma estrela de tipo espectral G2.
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A temperatura se relaciona com o índice de cor
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Luminosidade
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Anãs marrons
• Objetos com M<Ms/13 não queimam Hidrogênio, mas
podem queimar Deutério.
• M < 13 Mj não queimam Deutério e são planetas.
• As primeiras anãs marrons foram descobertas em 1995
(Teide 1 e Gliese 229B).
• Anãs marrons podem ter tipo espectrais adicionais como
L e T.
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Sequência de temperatura, incluindo as anãs marrons (L, T):
O B A F G K M L T
O Be A Fine Girl (Guy) Kiss My Lips Tenderly