Notices
Results 1 to 5 of 5

Thread: Iron core in white dwarfs?

  1. #1 Iron core in white dwarfs? 
    Forum Bachelors Degree PetTastic's Avatar
    Join Date
    Jul 2010
    Location
    London UK
    Posts
    421
    I was just reading up on white dwarfs for another thread and got thinking about what happens to the iron content of the original star. (2%)

    Would I be correct in thinking that most of the processes involved in going through the red giant phase to forming a white dwarf, would tend to concentrate the iron into the core?

    Then if you assume that the iron crushes down in a similar way, to the carbon & oxygen. does it make an even denser core at the centre of a star crushed down to the size of the earth?

    Any guesses on what effect and iron core would have?


    I believe in nothing, but trust gravity to hold me down and the electromagnetic force to stop me falling through
    Physics is the search for the best model not the truth, as only mythical beings know that.
    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Junior
    Join Date
    Mar 2008
    Posts
    267
    yes, as stars age the core becomes denser. That is why the fusion rate increases.


    according to wolfram

    the density of iron is

    7.8 g/cm^3

    the density of the solar core is

    (34 to 150) g/cm^3 (grams per cubic centimeter)

    white dwarf star mean density

    2.1 * 10^6 g/cm^3


    Reply With Quote  
     

  4. #3  
    Forum Bachelors Degree PetTastic's Avatar
    Join Date
    Jul 2010
    Location
    London UK
    Posts
    421
    The question is, is electron-degenerate iron denser than electron-degenerate carbon/oxygen?
    Or does it take more pressure to force iron down to the same density?
    I believe in nothing, but trust gravity to hold me down and the electromagnetic force to stop me falling through
    Physics is the search for the best model not the truth, as only mythical beings know that.
    Reply With Quote  
     

  5. #4 Casseopia A 
    New Member
    Join Date
    Mar 2012
    Posts
    4
    https://www.llnl.gov/str/Schneider.html. .

    The extreme conditions in white dwarf stars lead to highly ionized plasmas that are essentially bare nuclei of mostly carbon and oxygen, stripped of all their electrons. The electrons form a uniform background of negative charge, confining the star plasma much as the microplasma is confined by electric and magnetic fields in the RETRAP


    .
    Reply With Quote  
     

  6. #5  
    New Member
    Join Date
    Mar 2012
    Posts
    4
    The site above has an interesting outcome; both ends of the specturm, from extreme hot to extreme cold produce the same results. Have been looking for such .
    Reply With Quote  
     

Similar Threads

  1. iron
    By ahmeeeeeeeeeed in forum Earth Sciences
    Replies: 3
    Last Post: June 8th, 2011, 05:08 AM
  2. Iron oxidising and Iron Reducing bacteria
    By ttyo888 in forum Biology
    Replies: 1
    Last Post: April 23rd, 2010, 11:35 AM
  3. A question about iron.
    By Ryan M in forum Chemistry
    Replies: 1
    Last Post: April 20th, 2008, 06:29 PM
  4. I Need an Iron Core
    By guitarace372 in forum General Discussion
    Replies: 2
    Last Post: January 2nd, 2008, 09:32 PM
  5. Iron
    By The P-manator in forum Chemistry
    Replies: 8
    Last Post: January 17th, 2007, 03:46 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •