Radiative forces and abundance anomalies of manganese in peculiar stars

Statistics – Computation

Scientific paper

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A Stars, Abundance, Magnetic Stars, Manganese Ions, Peculiar Stars, Radiative Transfer, Stellar Atmospheres, Anomalies, Atomic Structure, Light Curve, Mercury (Metal), Particle Acceleration, Photoionization, Stellar Magnetic Fields, Stellar Temperature

Scientific paper

Detailed computations are presented of the radiative acceleration on manganese in the atmosphere and upper atmosphere of stars with log g equals 4 and an effective temperature ranging from 10,000 to 18,000 K where Mn II and Mn III are the dominant ions of manganese. A large number of radiative transitions are included, and a partial non-LTE treatment is applied to Mn III. It is noted that the ionization balance between Mn II and Mn III is calculated out of equilibrium and that the calculations contain no arbitrary parameters. The observed manganese overabundances and their apparent variations with effective temperature are found to be in agreement with the calculations. The results show that manganese accumulates in stellar atmospheres having an effective temperature less than or equal to 15,000 K.

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