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Abstract
The photospheric lines in the visual region of the cool magnetic CP star HR 7575 have been analyzed using a high-dispersion spectrogram obtained at the Dominion Astrophysical Observatory. The fully line-blanketed ATLAS9 model atmospheres of 10-times the solar metal content were employed to calculate the elemental abundances. The effective temperature Teff, derived from the optical and ultraviolet energy distributions, points to 8500 ± 300 K, while the ionization balance of iron is not reproduced at this effective temperature. The abundances derived from individual Cr I, Cr II, and Fe II lines apparently depend on their effective Lande factors. This implies that the Cr and Fe lines are intensified by the strong magnetic field on HR 7575. Their abundance enhancement is estimated to be about 0.7 dex based on a computation of the Unno-Beckers equation. The overall abundance patterns of HR 7575 are comparable to other cool magnetic CP stars. Of the analyzed elements, only Mg and Sc have nearly solar abundances, while Cr, Mn, Sr, and rare earths are overabundant by 1 to 5 dex.
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