Abstract
High signal-to-noise Canada-France-Hawaii telescope Reticon spectra are presented for the sharp-lined helium-strong stars Delta Ori C and HD 58260. Line profiles of the two stars have been modeled using a line synthesis program that incorporates the effects of a magnetic field and nonuniform abundances on the line profiles of a star. The star Delta Ori C displays very peculiar helium line profiles that can be reproduced with two different models: a helium-rich spot on an otherwise extremely helium-poor star or a vertical variation in the helium abundance from 0.40 below to 0.005 above tau 4471 = 0.35. HD 58260 also shows evidence of a similar, but less extreme, peculiarity. Both stars have substantial surface magnetic fields. Differential magnetic intensification of the Si III multiplet 2 lines indicate dipolar field strengths of approximately 9 kG for Delta Ori C and 8 kG for HD 58260. HD 58260 appears to be somewhat evolved, and has metal abundances 5-10 times lower than the roughly normal abundances of Delta Ori C.
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