High signal-to-noise coude Reticon spectra of the helium-strong star HD 64740 have been obtained for several rotational phases, in two spectral regions (3980-4160A and 4400-4580A) at the Canada-France-Hawaii telescope. These data, and previously published Zeeman analyzer observations, have been used to determine tentative abundance and magnetic field geometries of the star. Profile modeling has been performed with a line synthesis program that incorporates the effects of an assumed magnetic field and abundance distribution into the calculation of the line profiles. Helium appears to be overabundant in two spots near the magnetic poles of HD 64740. Silicon and magnesium show evidence for a high magnetic latitude band of enhanced abundances. Nitrogen and oxygen have roughly uniform abundances. The model suggests an inclination of 36 deg for the star's rotation axis, and a magnetic obliquity of approximately 78 deg. No constraint can be obtained on the surface magnetic field of HD 64740 with the current data. Additional observations are recommended.
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Bohlender et al. (1990) studied this question.
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