Optical spectroscopy of GX 339-4 -I. Orbital modulation
Optical spectroscopic observations of GX 339-4 were carried out between 1998 May (X-ray high state) and 1999 May (X-ray low state) over seven epochs. The equivalent width of Hα increased during the high state and then decreased during the low state. The
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|Source:||Monthly Notices of the Royal Astronomical Society|
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