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 Physics Software Physics Software Forum - Physics software for computers and calculators Nov 23rd 2016, 08:19 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, 11:32 AM   #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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See the forum rules here.   Nov 23rd 2016, 11:43 AM   #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 Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post thaakisfox Physics Software 4 Oct 5th 2016 11:04 AM 