Abstract
We present IUE observations and their analysis of the massive WN6+O binary system HDE 311884. The phase-dependent variations are like those of WN4-6 binaries studied previously, with atmospheric eclipses evident in the N IV 1718 A and C IV 1550 A lines, and in the Fe V+VI pseudocontinuum at λ < 1480 A. The considerable variability longward of 1700 A is due mostly to Fe II and Fe III lines
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