estrelas 2
DESCRIPTION
Curso de Introdução a Astronomia realizado na Escola Básica Prof.ª Herondina Medeiros Zeferino pelo Laboratório de Ensino de Geografia. Ministrado pelo professor Adolfo Stotz Neto, do Grupo de Estudos de Astronomia.TRANSCRIPT
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Centro de Filosofia e Ciências HumanasCentro de Filosofia e Ciências HumanasDepartamento de GeociênciasDepartamento de Geociências
Planetário / Grupo de Estudos de AstronomiaPlanetário / Grupo de Estudos de Astronomia
Estrelas 2
Estrutura de uma estrelaA Tabela dos isótoposCadeia de prótons e ciclo de carbonoNascimento de uma estrelaO diagrama HR
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A estrela Sol
333.000 massas da Terra
1.300.000 volumes da Terra
28 força gravidade da Terra
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T = ( 15 ) x 106 oC
P = ( 200 ) x 106 atm
H(92,1%) He (7,8%) outros (0,1%)
=
1.3
92.0
00 k
m
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prótons = número atômico nêutrons + prótons = massa atômica
decaimento
fusão
A tabela dos isótopos
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4H = He4
Ciclo de Carbono
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O NASCIMENTO DAS ESTRELAS
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. .... :
Ast
eroi
ds
Aster
oids
.. .
.
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Sol primordial Sol atual
H 700g 590g He 297g 407gOutros 3g 3g Raio 6,4 x 108m 7,0 x 108m
Tnúcleo 30 x 106 oC 15 x 106 oC
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Diagrama HR (Ejnar Hertzprung & Henry Noris Russel - 1914 )
M (magnitude absoluta) = mv + 5 – 5lg d
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Seqüência Principal
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Centro de Filosofia e Ciências HumanasCentro de Filosofia e Ciências HumanasDepartamento de GeociênciasDepartamento de Geociências
Planetário / Grupo de Estudos de AstronomiaPlanetário / Grupo de Estudos de Astronomia
Estrelas 3
Seqüência principalVida das estrelasEstabilidade e degeneraçãoA estrela de ChandrasekharA estrela de Landau
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anã marron
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M = mv+5-5logd
p = 1” d = 3,2 al (1parsec) M = mv para d = 10 parsec
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Vida e massa das estrelas na SP
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ESTABILIDADE E DEGENERAÇÃO DO SOL
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Nebulosa planetária
Anã branca
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Protostar
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esgota o combustível?
estabilidade = ( ? ) x gravidade
“A fôrça de Pauli só mantem a estabilidade das anãs brancas com < 1,44m sol que após algum tempo como GV, colapsam em anã branca e cessa a contração”
MCh = (2,018236 3) (hc/G)3/2 2
1/ (e m H)2
Limite de Chandrasekhar
aproximação dos e- força de repulsão de Pauli
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massa massa Chandra
ESTRELA de LANDAU (Lev Davidovich)
prótons + nêutrons (fusão)
Estrela de nêutrons
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Nebulosa do Caranguejo ( supernova 1054 )
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