4 ms·

So how is it that nickel is present on this thing with zero corresponding iron?

• ccgreg 1y ago
  > We report detection of CN emission and also detect numerous Ni I lines while Fe I remains undetected, potentially implying efficiently released gas-phase Ni. Where does it say there is zero iron? This is an upper bound, not zero.
  • galacticaactual 1y ago
    "FE I remains undetected" Remains Undetected. Pretty crystal clear.
    • ccgreg 1y ago
      No. Undetected iron and zero iron are different. Source: astronomer.
      • galacticaactual 1y ago
        "Undetected" is not an "upper bound." Source: computer scientist.
        • ccgreg 1y ago
          Undetected means you can compute an upper bound, based on the performance of your instrument. Again, these are undergraduate level concepts.
          • galacticaactual 1y ago
            Again, you’re being obtuse but well leave it there. Good day.