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Astronomy

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    $\begingroup$ As someone who works in the field, I have not seen your middle equation (with the $A$). [Fe/H] is often lazily conflated with [M/H], but obviously it depends on the detailed composition of the star whether that is approximately true. I suspect it is approximately true for Pop I stars, but perhaps not for older, metal poor stars which have a larger predominance of alpha elements. $\endgroup$
    – ProfRob
    Commented Apr 23, 2018 at 18:33
  • $\begingroup$ I have never seen that $A$ parameter either, I just saw it on WP an thought is sounded reasonable. Since I could not find a "proper" general definition for the relation between the $z$ metallicity and the $[Fe/H]$ iron content (aside from the one I show above, from the Bertelli article), I was not sure about its validity. You say that "[Fe/H] is often lazily conflated with [M/H]", so you agree that the A parameter sounds reasonable? $\endgroup$
    – Gabriel
    Commented Apr 23, 2018 at 18:40
  • $\begingroup$ Maybe I'll work out some $A$ values. $\endgroup$
    – ProfRob
    Commented Apr 23, 2018 at 18:52