By Kraml E 09012017 A NeutronStar not actually The Sun Source NASA A NeutronStar Comparison Diameter Mass Density Diameter Mass Density 14 x 106 km 2 x 1030 kg ID: 550920
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Slide1
Neutron-Stars
By
Kraml E.
09.01.2017Slide2
A Neutron-Star
(not
actually
)
The Sun
Source: NASASlide3
A Neutron-StarSlide4
Comparison
Diameter:
Mass
:
Density
:
Diameter:
Mass
:
Density
:
1.4 x 10^6 km
2 x 10^30 kg
1410 kg/m³
10 - 20 km
4
x 10^30 kg (2x
Ms
)
6
x 10^17 kg/m³
(4 x 10^14x
Density
of
Sun)Slide5
Formation
By
Richard Powell
Main
sequence
star
> 8
Ms
Nuclear
processes
lead
to iron
core
Shell-burning mass
deposits causes
core to exeed Chandrasekhar-limit
Increased
temperature
> 5 x 10^9 K
leads
to photodisintegration
Electrons and Protons combine to Neutrons-> Releasing Neutrinos
Neutron
degeneracy
pressure
stops
contraction
,
Neutrinos
are
flung
outward
creating
a
supernovaSlide6
Formation alternatives
Starting
mass < 8
Ms -> White Dwarf
Remnant
mass
> 3-5
Ms
-> Black hole
Starting
mass < 0.5 Ms
-> Cannot start
Helium-burning
Starting mass
between 8 – 12 Ms -> Neutron
star with 1.25 Ms
Maximum
observed
mass
of
neutron stars is 2.01
MsSlide7
Gravity
by
Corwin ZahnSlide8
Magnetic
field
On Earth:
Medical MRI: 1.5 – 3 T HighRes MRI: 7 – 9.4 T
Levitating
Frog
: 16 T
Laboratory,
continous
: 45 T Laboratory, pulse(non-destructive): 100T Laboratroy , pulse: 10^3 T
Neutron Star: 10^4 – 10^11 T
Magnetar
: 10^8 – 10^11 TSlide9
Radiation
Pulsars (
pulsating
radio
star)
Non-
pulsating
neutron
star
Radio-
quiet
neutron
star
Source: Wikipedia