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    • NLTE spectral analysis of helium-rich sdO stars from the southern HK survey. 

      Drilling, J.S.; Napiwotzki, R.; Dreizler, S.; Heber, U.; Beers, T.C. (Astronomical Society of the Pacific, 1996)
      We have determined effective temperatures, surface gravities, and helium-to-hydrogen abundance ratios by fitting NLTE model atmospheres to high signal-to-noise- spectra of eight helium-rich sdO stars detected in the southern ...