Transcript Supernovae, Neutron Stars, Black Holes

__1. _________

The Most violet explosion in the universe is
called a _______________
Supernovae Explosion
the supernova explosion of SN 1987A. ---- a 1028 megaton bomb (i.e., a few
octillion nuclear warheads).
SN 1987 A Today
____2. ________

After a star explodes, the expanding cloud
of gas visible in space is called a
_________________
Supernova remnant N 63A in the
Large Magellanic Cloud.
3.

Stars similar in mass to our sun will fuse
Helium to ____________ and _________ ,
while stars with cores more massive than
three solar masses will create elements as
heavy as ___________ and ___________
Fusion Shells
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C, O are
end points
for low
mass stars
Fe, Ni are
end points
for high
mass
stars.
4.

While fusion of elements lighter than
_______ produce energy, fusion of this
element produces no energy, triggering the
implosion of the core.
Fusion of Fe triggers -Implosion
andexplosion
Did a Supernova create us?
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Triggering the Formation of the Solar System
--- New data from meteorites indicates that formation of the Solar System
was triggered by a supernova.
Written by G. Jeffrey Taylor
Hawai'i Institute of Geophysics and Planetology
One of the most amazing discoveries in space science is the unambiguous
evidence from meteorites that the solar nebula (the cloud of gas and dust
in which the Sun and planets formed) contained radioactive isotopes with
half-lives so short that they no longer exist. These include isotopes with
very short half-lives, such as calcium-41, 41Ca, (100,000 years) and
aluminum-26, 26Al, (740,000 years), and those with longer half-lives such
as plutonium-244, 244Pu, (81 million years). The short-lived isotopes are
particularly interesting. If they formed in an exploding star, that explosion
might have triggered the collapse of the huge interstellar cloud in which the
Sun formed.
5. After the supernovae explosion

The collapsed core of the star is left behind
as a ___________ with a density equal to
that of an ______________
Neutron Stars

Same
density as
Atomic
Nucleus
(1014 g/cm3)
Isolated Neutron Star

The Hubble Space Telescope
succeded in taking an image of a
neutron star located less than
400 light-years away from Earth.
This star was previously detected
by its Xray radiation, indicating a
surface temperature around
700,000°.
Its diameter is less than 28 km.
6.

Because Neutrons are tiny magnets that
align with one another, neutron stars have
tremedous magnetic fields. If the neutron
star rotates, with its magnetic field axis
misaligned with its spin axis, its called a
______________
A Pulsar: Magnetic Fields off the
charts!
7.
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The disk of matter surrounding a collapsed
object like a neutron star is called an
_____________
Neutron Star and Accretion Disk
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Center of Crab
SN Remnant
Chandra X-tel
8.
When a White dwarf gains mass and
exceeds the _____________ limit of 1.4
solar masses it becomes a type
_________Supernovae.
 When a massive star with a core greater
than 1.4 solar masses implodes and
explodes, it becomes a type ___________
Supernovae.
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Type I Supernovae in progress! a star
and White Dwarf.
Tycho’s Supernovae Remnant
Neutron Vs. Quark Stars?
Enough Gravity to Bend Light
Superbang! Neutron Stars can Collide