razvoj zvezd
DESCRIPTION
Razvoj zvezd. Življenje zvezd. Nastanek iz medzvezdnega plina z m> M Jeans Numerična simulacija (http://www.ukaff.ac.uk/starcluster/). razvoj zvezd. boj gravitacij e proti tlaku :. zlivanje atomskih jeder. Planetarna meglica C,O. - PowerPoint PPT PresentationTRANSCRIPT
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Razvoj zvezd
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Življenje zvezd
• Nastanek iz medzvezdnega plina z m> MJeans
• Numerična simulacija (http://www.ukaff.ac.uk/starcluster/)
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razvoj zvezdboj gravitacije proti tlaku:
zlivanje atomskih jeder
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Planetarna meglicaC,O
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• Goriva zmanjka, zvezda se krči (nevtronsko zvezdo ali črno luknjo) gravitacijska energija
• Eksplozija supernove: core collapse Sn ali Tip II, Tip Ib, Ic, izbruhi žarkov gama)
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SN 1604Keplerjeva SN
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meglica RakovicaSN 1054
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SN Tip Ia
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Vir: NASA
čas v sekundah
sunk
i na
seku
ndo
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optični “afterglow”
Vir: NASA, Vesoljski teleskop Hubble
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kolaps zvezde
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zlitje nevtronskih zvezd
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...in konec
zgornja meja za maso:- bele pritlikavke: Chandrasekharjeva limita =1.4 MS
- nevtronske zvezde: 2-10 MS
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Velikosti in gostote
premer gostotaSonce 1.400.000 km 1,4 kg/dm3
bela pritlikavka 15.000 km 1000 ton/dm3
nevtronska zvezda 20 km 1015 kg/dm3 !!!črna luknja 15 km ?
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Vela
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Kako opaziti črne luknje?
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dvojni zvezdni sistemi
*
periodični Dopplerjev premik spektralnih črt
rentgentske dvojnice: ena zvezda nevidna, rentgentski izvor:
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stava – Labod X1
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