Physics Help Forum Problem in Mathematica

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 Nov 23rd 2016, 09:19 AM #1 Junior Member     Join Date: Nov 2016 Posts: 2 Problem in Mathematica Hello to all. This is my first post in this forum I've been trying to plot some graphs on Mathematica but I have faced some troubles so far. I am working on this paper by Lattimer on binary systems: https://arxiv.org/abs/astro-ph/0002203 I am trying to reproduce Figure 11 but something seems to go wrong. Here's what I have done so far: we set q=$\frac{m_{ns}}{M_{bh}}$ the ratio of the neutron star mass and the black hole mass. then we set the radius $\frac{R_{l}}{a} = 0.46\bigg(\frac{q}{1+q}\bigg)^{1/3}$ with a being the semi major axis that follows $a<2.8 \bigg[ \frac{M_1 M_2 (M_1+M_2)}{〖M^3_ {\odot}〗} \bigg]^{\frac{1}{4}} R_{\odot}$ The first thing to plot is the neutron star radius versus the neutron star mass. Then we must plot $\frac{d \ln{R}}{d \ln{m_{ns}}}$ ( which derivative simply leads to $\frac{m_{ns}}{R} \frac{dR}{dm_{ns}}$) versus the neutron star mass $m_{ns}$ I've been trying to plot these functions for days but what I get is far from the desired results.... Any help would be very appreciated
Nov 23rd 2016, 12:32 PM   #2

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 Originally Posted by stellaphysics Hello to all. This is my first post in this forum I've been trying to plot some graphs on Mathematica but I have faced some troubles so far. I am working on this paper by Lattimer on binary systems: https://arxiv.org/abs/astro-ph/0002203 I am trying to reproduce Figure 11 but something seems to go wrong. Here's what I have done so far: we set q=$\frac{m_{ns}}{M_{bh}}$ the ratio of the neutron star mass and the black hole mass. then we set the radius $\frac{R_{l}}{a} = 0.46\bigg(\frac{q}{1+q}\bigg)^{1/3}$ with a being the semi major axis that follows $a<2.8 \bigg[ \frac{M_1 M_2 (M_1+M_2)}{〖M^3_ {\odot}〗} \bigg]^{\frac{1}{4}} R_{\odot}$ The first thing to plot is the neutron star radius versus the neutron star mass. Then we must plot $\frac{d \ln{R}}{d \ln{m_{ns}}}$ ( which derivative simply leads to $\frac{m_{ns}}{R} \frac{dR}{dm_{ns}}$) versus the neutron star mass $m_{ns}$ I've been trying to plot these functions for days but what I get is far from the desired results.... Any help would be very appreciated
I am unable to find a way to view the paper? I don't think we can answer this without seeing the plot.

-Dan
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Nov 23rd 2016, 12:43 PM   #3
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 Originally Posted by topsquark I am unable to find a way to view the paper? I don't think we can answer this without seeing the plot. -Dan
yeah for some reason this link doesn't work anymore....
Here's another form that I uploaded.

Pdf page 22 Fig.11
Attached Files
 Nuclear matter and its role in supernovae, neutron stars and.pdf (525.5 KB, 3 views)

 Tags mathematica, neutron star, plot, problem, radius

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