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Betelgeuse will go supernova??

  1. Jul 26, 2009 #1
  2. jcsd
  3. Jul 26, 2009 #2

    Astronuc

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    Staff: Mentor

    Betelgeuse is being monitored.

    Betelgeuse, Red Supergiant In Constellation Orion, Has Shrunk By 15 Percent In 15 Years
    http://www.sciencedaily.com/releases/2009/06/090609220555.htm

    Red giant star Betelgeuse mysteriously shrinking (UC Berkeley News)
    http://berkeley.edu/news/media/releases/2009/06/09_betelim.shtml

    Where do supernovae come from?

    Two Dying Red Supergiant Stars Produced Supernovae
    http://www.sciencedaily.com/releases/2009/03/090319142405.htm

    AAVSO really needs to update this - http://www.aavso.org/vstar/vsots/1200.shtml [Broken]
     
    Last edited by a moderator: May 4, 2017
  4. Jul 28, 2009 #3

    Chronos

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    Betelguese will someday go supernova, but, probably not today. The oscillations observed over the last century do not appear unusual for such a star. It will do should do this oscillation thing many times before it gives up the ghost. Best guess is it has at least a hundred million years left before the big event.
     
  5. Jul 30, 2009 #4
    Last edited by a moderator: Apr 24, 2017
  6. Jun 2, 2010 #5
    My understanding is it is extremely unlikely Betengeuse will last that long. It's a gigantic star (the ninth largest known), burning through its fuel at a prodigious rate, and is believed to be significantly less than ten million years old. At this point in its stellar evolution, its chances of lasting another million years before it goes supernova are considered slim, and a hundred million years is almost certainly out of the question.
     
  7. Jun 7, 2010 #6
    I agree with this information however, many people think the supernova will occur in the next 1000 years. the star is about 640 light years away and is as Unix said, very old. It would be cool to see but we are unlikely to see it.
    cheers, BT
     
  8. Jun 9, 2010 #7

    HST_SN_1987A_20th_anniversary.jpg
    Type II-P supernova

    Main sequence solar lifetime:
    [tex]t_{L} = 11 \cdot 10^{9} \; \text{y} [/tex]

    Red supergiant star stellar lifetime:
    [tex]\boxed{\tau_{rs} = t_{L} \left(\frac{m_{\odot}}{m_s} \right)^{2.47908}}[/tex]

    [tex]m_{\odot}[/tex] - solar mass
    [tex]m_s[/tex] - stellar mass

    Betelgeuse mass:
    [tex]m_s = 18 \; m_{\odot}[/tex]

    Stellar lifetime for red supergiant star with Betelgeuse mass:
    [tex]\boxed{\tau_{rs} = 8.501 \cdot 10^6 \; \text{y}}[/tex]

    Betelgeuse may explode in a type II supernova within the next thousand years.

    Reference:
    http://en.wikipedia.org/wiki/Main_sequence#Lifetime"
    http://en.wikipedia.org/wiki/Betelgeuse#Fate"
    http://en.wikipedia.org/wiki/Semiregular_variable_star" [Broken]
     
    Last edited by a moderator: May 4, 2017
  9. Jun 9, 2010 #8

    Borek

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  10. Jun 9, 2010 #9

    Borek

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    Re: Betelgeuse will go supernova??

    Sorry, 10 million years in stellar terms is a newborn. 10 billion years would be a lot.
     
  11. Jun 9, 2010 #10
    It's a supergiant. they don't live very long.
    cheers, BT
     
  12. Jun 11, 2010 #11
    There is a lot about this class of star, and Betelgeuse in particular that is somewhat mysterious, including mass-loss. I think it's a bit hopeful to think it will explode within a thousand years, but your point with Borek is still valid; these stars do not live for 10 million years, never mind a billion. I think the best estimate of age is 8.5 million years, and it would be impressive if it saw 9 million.
     
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