7 - Stellar Evolution-II. Surface abundances vs. time and mass loss time What’s at the surface.

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Presentation transcript:

7 - Stellar Evolution-II

Surface abundances vs. time and mass loss time What’s at the surface

“Si-burning”

Pre-supernova structure for 15 solar-mass star surfacecore

original CNO cycle 3He C,O C Ne,Mg,O Ne Mg,O OS,P,Mg,Si Si all kinds of stuff

8

Supernovae Type II (young massive stars)

White Dwarfs Non-relativistic degenerate electronsRelativistic degenerate electrons

Mass-Radius Relation & Chandrasekhar Mass NOTE!

Massive Stars - Post-Collapse Plus “Supernova Remnant” (SNR) Crab Nebula (visible light - VLT)Kepler’s SN (X-rays - Chandra) Tycho’s SN (X-rays - Chandra) Cygnus Loop “Veil Nebula”

Neutron Stars

Black Holes

Novae (plural of nova) Nova Cyg 1975

gas emission linesdust production Examples of spectra of novae at near IR wavelengths

Supernovae Ia Accretion onto WD sends it over the Chandrasekhar Limit Animation SN Ia One problem: getting these to actually explode the right way has been a challenge. I recent years, the idea of colliding white dwarf stars in binary, or better yet, triple star systems has become much more attractive.

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