SSC/Stability/GammaVariation: Difference between revisions

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Created page with "=How Does Stability Change with γ<sub>g</sub>?= ==Isolated Uniform-Density Configuration== =How Does Stability Change with P<sub>e</sub>?="
 
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==Isolated Uniform-Density Configuration==
==Isolated Uniform-Density Configuration==


From the [[SSC/Stability/UniformDensity#Sterne's_General_Solution|general solution]] derived by {{ Sterne37full }}, we have &hellip;
<table border="1" cellpadding="2" align="center">
<tr>
  <td colspan="1" align="center">
[[File:Sterne1937SolutionPlot1.png|350px|center|Sterne (1937)]]
  </td>
  <td colspan="1" align="center">
[[File:Sterne1937CritGamma1.png|350px|center|Sterne (1937)]]
  </td>
</tr>
</table>


The first few solutions are displayed in the following boxed-in image that has been extracted directly from &sect;2 (p. 587) of {{ Sterne37 }}; to the right of his table, we have added a column that expressly records the value of the square of the normalized eigenfrequency that corresponds to each of the solutions presented by {{ Sterne37hereafter }}.
<div align="center">
<table border="2" cellpadding="5" width="70%">
<tr>
  <td align="center" colspan="1">
Table of exact eigenvector expressions extracted from &sect;2 (p. 587) of &hellip;<br />
{{ Sterne37figure }}
  </td>
  <td align="center" colspan="1">
<math>\frac{n^2}{4\pi G \bar\rho}</math>
  </td>
</tr>
<tr>
  <td colspan="1" rowspan="1">
<!-- [[File:Sterne1937SolutionTable1.png|600px|center|Sterne (1937)]] -->
    <table border="0" align="left">
    <tr>
    <td align="right"><math>j=0 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\mathfrak{F}=0 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right">&nbsp;<math>\xi_1 = 1</math></td>
    </tr>
    </table>
  </td>
  <td align="center"><math>\gamma - 4/3</math></td>
</tr>
<tr>
  <td colspan="1" rowspan="1">
    <table border="0" align="left">
    <tr>
    <td align="right"><math>j=1 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\mathfrak{F}= 14 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\xi_1 = 1 - (7/5)x^2</math></td>
    </tr>
    </table>
  </td>
  <td align="center"><math>2(5\gamma - 2)/3</math></td>
</tr>
<tr>
  <td colspan="1" rowspan="1">
    <table border="0" align="left">
    <tr>
    <td align="right"><math>j=2 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\mathfrak{F}= 36 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\xi_1 = 1 - (18/5)x^2 + (99/35)x^4</math></td>
    </tr>
    </table>
  </td>
  <td align="center"><math>7\gamma - 4/3</math></td>
</tr>
<tr>
  <td colspan="1" rowspan="1">
    <table border="0" align="left">
    <tr>
    <td align="right"><math>j=3 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\mathfrak{F}=66 \, ;</math>&nbsp; &nbsp; &nbsp;</td>
    <td align="right"><math>\xi_1 = 1 - (33/5)x^2 + (429/35)x^4 - (143/21)x^6</math></td>
    </tr>
    </table>
  </td>
  <td align="center"><math>12\gamma - 4/3</math></td>
</tr>
</table>
</div>


=How Does Stability Change with P<sub>e</sub>?=
=How Does Stability Change with P<sub>e</sub>?=

Revision as of 20:31, 3 January 2024

How Does Stability Change with γg?

Isolated Uniform-Density Configuration

From the general solution derived by 📚 T. E. Sterne (1937, MNRAS, Vol. 97, pp. 582 - 593), we have …

Sterne (1937)
Sterne (1937)
Sterne (1937)
Sterne (1937)

The first few solutions are displayed in the following boxed-in image that has been extracted directly from §2 (p. 587) of 📚 Sterne (1937); to the right of his table, we have added a column that expressly records the value of the square of the normalized eigenfrequency that corresponds to each of the solutions presented by Sterne37.

Table of exact eigenvector expressions extracted from §2 (p. 587) of …
T. E. Sterne (1937)
Models of Radial Oscillation
Monthly Notices of the Royal Astronomical Society, Vol. 97, pp. 582 - 593

n24πGρ¯

j=0;      𝔉=0;       ξ1=1
γ4/3
j=1;      𝔉=14;      ξ1=1(7/5)x2
2(5γ2)/3
j=2;      𝔉=36;      ξ1=1(18/5)x2+(99/35)x4
7γ4/3
j=3;      𝔉=66;      ξ1=1(33/5)x2+(429/35)x4(143/21)x6
12γ4/3

How Does Stability Change with Pe?