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I Variations in the speed of sound in a star

  1. Sep 11, 2018 #1
    I try to understand the following graphics with x-axis being the radius of a typical star :


    I would like to knwo if ##\delta c/c## (y-axis) represents the relative error between theorical and experimental values or if it represents the fluctuations of speed of sound inside. If these are fluctuations, one could get the mean speed all over radii or standard deviation.

    I am not sure what it is exactly.

    Any help is welcome
    Last edited by a moderator: Sep 11, 2018
  2. jcsd
  3. Sep 11, 2018 #2


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    Staff: Mentor

    Can you give the source link? Even when using the Upload feature to attach a figure to your post, it is a good practice to post the source link. It also helps to avoid copyright issues. Thanks.
  4. Sep 11, 2018 #3
    lecture is available on this link

    Thanks in advance
  5. Sep 11, 2018 #4


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    Science Advisor

    That's it. As explained in the graph on the previous page of the presentation you linked.
  6. Sep 12, 2018 #5
    So the main discrepancy in current models is in the zone 0.4 - 0.65 R/R0 : can anyone could explain what's the origin of this issue ?

    at R = 0.4 - 0.65 R0, are we in radiative or convective zone ?

  7. Sep 12, 2018 #6
    Could anyone help me on this current discrepancy ? or if someone had stellar physics knowledge ... thanks
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