TL;DR
This paper reviews multiple indirect methods to estimate the solar argon abundance, providing a recommended value based on diverse astrophysical data and nucleosynthetic considerations.
Contribution
It compiles and evaluates various indirect measurements to determine the solar argon abundance, offering a new recommended value with uncertainty estimates.
Findings
Recommended solar argon abundance: A(Ar) = 6.50 ± 0.10
Solar system argon abundance: A(Ar) = 6.57 ± 0.10
Derived from multiple astrophysical sources and nucleosynthesis arguments
Abstract
The solar argon abundance cannot be directly derived by spectroscopic observations of the solar photosphere. The solar Ar abundance is evaluated from solar wind measurements, nucleosynthetic arguments, observations of B stars, HII regions, planetary nebulae, and noble gas abundances measured in Jupiter's atmosphere. These data lead to a recommended argon abundance of N(Ar) = 91,200(+/-)23,700 (on a scale where Si = 10^6 atoms). The recommended abundance for the solar photosphere (on a scale where log N(H) = 12) is A(Ar)photo = 6.50(+/-)0.10, and taking element settling into account, the solar system (protosolar) abundance is A(Ar)solsys = 6.57(+/-)0.10.
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