09 The death of stars.pdf - The death of stars Ring Nebula...

The death of stars

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¦¥ing
tutebula

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ºhrough a small telescope, some look
disk-shaped, as a planet would.
ºhey have nothing to do with
planets!
ºhe ejected material expands and glows as a
planetary nebula.
5ing 1ebula

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OOelix tutebula OOourglass
tutebula
utterfly
tutebula
±nt tutebula !at’s Fye tutebula
hihittle Ghost tutebula

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Different shapes due
to our perspective

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hiheft image is infrared, right image is X-rays
­irius ± and
± white dwarf is the hot leftover carbon core of a
low-mass star.

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White dwarfs are about the size of the Farth.

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White dwarfs are incredibly dense objects.
±bout $40 million worth
of gold

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What holds up a white dwarf against collapse?
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ºhe maximum mass for a W' is 1.4 rsr
sun
.

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­ubrahmanyan
!handrasekhar
Chandrasekhar calculated
the maximum mass of a
white dwarf when he was
20 years old!
1.4 M
sun
= the
Chandrasekhar limit

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± white dwarf will cool over time and crystallize...
V886 !entauri; “hihucy”; 90% solid carbon?
± “jeweler’s” representation!

Binary star system = 2 stars
orbiting around each other

Binary star system = 2 stars
orbiting around each other