astro 113 week7 - physics & astronomyphysics.gmu.edu/~pesce/astro113/astro_113_week7.pdf ·...
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Astronomy 113Dr. Joseph E. Pesce, Ph.D.
© Dr. Joseph E. Pesce, Ph.D.
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Stellar Deaths/Endpoints
© Dr. Joseph E. Pesce, Ph.D.
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Low Mass Stars³ Like the Sun (< 2 M )
² �Live� about 10 billion years (sun is middle aged)² Create elements through Carbon, Nitrogen, and Oxygen through fusion
³ Core uses up He, C & O left, reactions stop³ Core collapses, shells of He and H ignite³ Envelope expands (T down L up)³ Becomes an Asymptotic Giant Branch star (AGB), very bright and enormous³ Pulsations in core fusion rate (every ~300,000 years) blow away bloated
atmosphere³ Outer atmosphere cools, dust forms, shell of atmosphere ejected and hot core
exposed, ionizing gas, causing it to glow² A Planetary Nebula is formed
q Expands to low density in ~50,000 yrs
13-2
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Low Mass Stars
T
L * He Flash
Planetary Nebula
AGB
13-3
H
C,O
He C,O
H He
He
© Dr. Joseph E. Pesce, Ph.D.
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Low Mass Stars
³ Matter is returned to ISM (it is enriched)
³ C-O core is never ignited, it�s a left-over ember (white dwarf)
²Degenerate electrons, the size of the Earth
²Just cools thermally
²Very high density
²White dwarfs can’t be more massive than 1.4 M = Chandrasekar Limit
13-4
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The Life Cycle of a Low-Mass Star(After 10 billion years)
²Expands into a Red Giant (radius to ~Earth’s orbit)
²Outer atmosphere blows off to become a Planetary nebula
²Burned out core left as a White dwarf
13-5
© Dr. Joseph E. Pesce, Ph.D.
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The Evolution of a Low-Mass Star13-6
© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.
Red Giant
&Planetary Nebula
Not to scale= Earth�s orbit© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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High Mass Stars³5-50 times the mass of the sun
²Last about 1 million years (very short!)²Create elements through iron (fusion)²�Onion skin�²Expand into Red Supergiant²Explode as a supernova²Leave behind neutron stars or black holes
13-13
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High Mass Stars³ Mass high enough after He fusion finishes that compression
ignites:² Carbon (T = 600 million K)² Neon (T = 1.2 billion K)² Oxygen (T = 1.5 billion K)
³ Fuses all of these at ever-increasing rates
² For 25 M C - 600 yrsNe - 1 yrO - 6 monthsSi - 1 day (at 2.7 billion K)
13-14
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High Mass Stars³ Fusion in shells (onion skin) leads to High L and Large R³ Supergiants (radius is out to orbit of ~Mars)³ Fuses through IRON, but iron in core is a problem
² Because iron requires more energy to fuse than it produces
³ Fusion in core stops, core collapses³ At first, degeneracy holds, but then it exceeds Chandrasekar limit (from
shell-fusion ash)
13-15
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© 2007-2014 Joseph E. Pesce, Ph.D.
Core - Fe
Outer Atmosphere - Hydrogen
Ca
Si
…
Ar
Ne
C
He
Onion-skin nature of High Mass Stars
Not to scale© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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Type II Supernova³ Core collapses catastrophically
² 1/10 sec, T~5 billion K² g-rays tear apart iron atoms² Neutrinos formed but can’t escape tremendous pressures² Material falling into core bounces back out, burning and blasting everything in it’s way² Extremely high T and densities in the shock wave² Outer atmosphere blasted, fused, neutrons create elements heavier than iron² Radioactive decay creates other elements² Extremely bright (outshining all other stars in galaxy briefly (200 billion)
³ TYPE II supernova
13-18
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Type I Supernova³ Begins as white dwarf³ If in binary, mass transfer can take place (see binaries above)³ White dwarf mass exceeds Chandrasekar limit and it explodes
³ TYPE I supernova
13-19
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Nova³Non-disruptive explosions of material
falling onto a White Dwarf from the accretion disk
³Object brightens for a short time, then fades
³Periodic
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.
•
Inside the Supernova - 1a Massive
Outer Atmosphere
Time = 0 sec
Orbit of Mars
Not to Scale
•
Core -the size of Earth
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© 2007-2014 Joseph E. Pesce, Ph.D.
Core -the size of Earth
Inside the Supernova - 1b Massive
Outer Atmosphere
Time = 0 sec
Not to Scale© Dr. Joseph E. Pesce, Ph.D.
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Inside the Supernova - 2 Massive
Outer Atmosphere
Time = T+1/4 sec
Not to Scale
Core collapses
Neutron Star forms - 10km;or Black hole!
Matter falls in at near light speed
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Inside the Supernova - 3
Time = T+1 sec
Not to Scale
Matter falls in at near light speed
Collapsing material hits central object and bounces
Neutron Star forms - 10km;Or Blackhole!
Massive quantities of neutrinos form - try to escape but can’t !!!!
High Temperature and Pressure lead to extreme fusion, massive quantities of protons, neutrons, & gamma-rays
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Inside the Supernova - 4 Massive
Outer Atmosphere
Time = T+10 sec
Not to Scale
Blast wave, propelled by neutrinos and gamma-rays, fuses material as it goes
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Inside the Supernova - 5
Time = T+10 min
Not to Scale
Blast wave continues to destroy stellar atmosphere
Neutrinos and gamma-rays finally fly free
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The Aftermath - 6 Time = T+1 hour
Not to Scale
Supernova remnant
A chaotic, hot environment full of extremely high speed neutrons, protons, and electrons, gamma/X-rays, leading to the formation of elements heavier than Iron by neutron bombardment and radioactive decay.
The remnant continues to expand and dissipate over the next 10s of thousand years, adding material for the next generation stars.
The central object--blackhole or neutron star--heats the remnant and eventually is all that remains of the once-mighty star.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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Supernova: The Animation
Time = 0 secTime = T+1/4 secTime = T+1 secTime = T+10 secTime = T+10minTime = T > 1 hourTime = T+1-10,000 yearsTime = T > 10,000 years
Black hole or neutron star remains
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.© Dr. Joseph E. Pesce, Ph.D.
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Vela - ~10,000 yrs old© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.The Crab – From 1054
© Dr. Joseph E. Pesce, Ph.D.
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© 2007-2014 Joseph E. Pesce, Ph.D.The Crab – From 1054Chaco Canyon, NM© Dr. Joseph E. Pesce, Ph.D.
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End States of Supernovae: Pulsars³ Collapsed core of high mass
star/supernova³ 10km diameter, extremely high
density³ Some are highly magnetized³ All spin rapidly³ Beam of particles squirted from
Magnetic axes• If toward us, see regular pulses• Can be 100s of pulses per second
13-34
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View From Earth:Rotation axis Magnetic Poles
To Earth
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Pulsars in radio:
89.3ms= 11/sec
13-36
Vela: 89ms (11x / sec)
Crab: (30x/sec)Youngest
B1937+21: (642x/sec) ; rotating 14% c !2nd fastest
B0329+54: 0.714519s (1.4 rot/sec)
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13-37Endstates of Supernovae: Blackholes
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Blackholes³3 times mass of the sun to billions of times³Small ones among stars in galaxies³Large ones, apparently at center of every
galaxy³Matter falling in heats up and we see it³Consumes locally, but has effect on larger
scales (jets)³What goes in can’t come out³Don’t know anything about interior (physics
doesn’t �work�)
13-38
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Evolution of High-Mass Stars13-39
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Importance of High Mass Stars
³Create all elements though Fe internally³Create all heavier elements in explosion³Explode and disperse elements to next
generation stars³Stimulate star formation³We wouldn’t be here but for high mass
stars!!
We ARE star stuff!!
13-40
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Thank You!
© Dr. Joseph E. Pesce, Ph.D.