The Manganese Star Phi Herculis

A detailed abundance analysis of the manganese star Her is carried out; the analysis employs a model atmosphere with T, = 12500 K, log g = 4.0, N(He)/N(H) = 0.12, and with a microturbulent velocity of 2.5 km . The observed spectral energy distribution and H profile are satisfactorily reproduced by the model. The abundances derived from neutral and ionized iron are not the same; this may be due partly to bad f-values and partly to the effect of line blanketing on the temperature distribution in the outer layers of the atmosphere. The analysis shows that the light metals have normal abundance, as do iron and cobalt, while scandium, titanium, and the remaining heavy elements are 10-1000 times overabundant with respect to adopted solar values. Inaccuracies in the f-values cannot remove these abundance differences, since the same system of f-values was used in both the Sun and the star.