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

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The death of stars
6¦¥ingtutebula
7ºhrough a small telescope, some lookdisk-shaped, as a planet would.ºhey have nothing to do withplanets!ºhe ejected material expands and glows as aplanetary nebula.5ing 1ebula
8OOelix tutebulaOOourglasstutebulautterflytutebula±nt tutebula!at’s Fye tutebulahihittle Ghost tutebula
9Different shapes dueto our perspective
10hiheft image is infrared, right image is X-rays­irius ± and± white dwarf is the hot leftover carbon core of alow-mass star.
11White dwarfs are about the size of the Farth.
12White dwarfs are incredibly dense objects.±bout $40 million worthof gold
13
What holds up a white dwarf against collapse?
14
16ºhe maximum mass for a W' is 1.4 rsrsun.
17­ubrahmanyan!handrasekharChandrasekhar calculatedthe maximum mass of awhite dwarf when he was20 years old!1.4 Msun= theChandrasekhar limit
18± white dwarf will cool over time and crystallize...V886 !entauri; “hihucy”; 90% solid carbon?± “jeweler’s” representation!
Binary star system = 2 starsorbiting around each other
Binary star system = 2 starsorbiting around each other

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Term
Spring
Professor
DavidColeman
Tags
Astronomy, Supernova, White dwarf

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