OB-type subdwarf HD 149382 and the nature of the subdwarf B stars

High-dispersion spectra and monochromatic continuum measures of the subdwarf OB star HD 149382 have been obtained and analyzed to yield the atmospheric parameters T)=40,000 K, log g=5.8. Helium is deficient by a factor 10 compared to Population I. Sulfur is the only element, other than hydrogen and helium, observed in the blue spectrum of this object. Analysis shows that, compared with Population I, it is overabundant by a factor of about 10, while all other heavy elements are probably underabundant. Comparison with other subdwarfs shows that HD 149382 together with Feige 66 represent intermediate cases between the subdwarf B and subdwarf O classes