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Wind absorption effects in the NIV 1718Å line in the WN4+O5 binary HD 90657
C. Lloyd, D. J. Stickland
Journal:

Symposium - International Astronomical Union / Volume 163 / 1995

Published online by Cambridge University Press:

07 August 2017, pp. 239-240

Print publication:

1995
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Using a simple absorption line model the phase dependent effects of ‘wind eclipses’ have been studied for the N IV 1718Â line in the WN4+05 binary, HD 90657. The varying strength of the absorption, as measured by the equivalent width, has been compared with the model for a range of wind parameters and assumptions. It is found that the fraction of absorbing atoms drops quickly, to the first or second power of the radius, and that a significant fraction persists beyond 60 R⊙.