occasional meanderings in physics' brave new world
Marni D. Sheppeard
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Lieven Le Bruyn
Todd and Vishal
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The AF Book
posted by Kea | 9:25 PM
On the graph, I can't understand why the ratio of mass of iron to hydrogen can take negative values. What does that mean? (Has someone discovered that the iron in some planets is antimatter?)
Nigel, view the link on metallicity. Most star measures are defined in terms of the sun - in this case by taking the difference of 2 logarithms.
Thanks! I think the simple ratio label [Fe/H] on the axis is just a little misleading if it is logarithmic. But that's the software.
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