Optical spectroscopy of GX 339-4 during the high—soft and low—hard states — II. Line ionization and emission region

  title={Optical spectroscopy of GX 339-4 during the high—soft and low—hard states — II. Line ionization and emission region},
  author={Kinwah Wu and Roberto Soria and Richard W. Hunstead and Helen Margaret Johnston},
  journal={Monthly Notices of the Royal Astronomical Society},
We have carried out observations of the X-ray transient GX 339-4 during its high-soft and low-hard X-ray spectral states. Our high-resolution spectroscopic observation in 1999 April suggests that the H alpha line has a single-peaked profile in the low-hard state as speculated in our previous paper. The He II lambda 4686 line, however, has a double-peaked profile in both the high-soft and low-hard states. This suggests that the line-emission mechanism is different in the two states. Our… Expand

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