2024RNAAS...8..203M

The weak line of Hg II located at 5677.10 Å is used to measure the mercury abundance in the HgMn star HD 174933 (112 Her). This line is detected at 3σ above the noise in the adjacent continuum. The synthesis of this line, confirms a large overabundance of mercury, about +4.54 dex, which is less than the excess derived from the 3983.93 Å line in earlier studies. The synthesis of lines in five spectral regions yields estimates of the abundance deficienciess/excesses for twelve other elements. Helium, carbon and magnesium are very depleted, titanium, manganese and iron are moderately overabundant. Strontium, yttrium, zirconium and barium have solar abundances upper limits. Phosphorus, gallium and mercury are very overabundant. The abundance pattern of 112 Her differs from that of other HgMn stars as already stressed in previous studies.