Variability in X-ray line ratios in helium-like ions of massive stars: The wind-driven case

R. Ignace, Z. Damrau, K. T. Hole, W. L. Waldron
2019 Astronomy and Astrophysics  
doi:10.1051/0004-6361/201834752 fatcat:hu2q2wkfrveydagtuwocx3lcoa