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X-rays, clumping and wind structures
Ignace, Richard; Oskinova, Lidia; Hamann, Wolf-Rainer +1 more
X-ray emission is ubiquitous among massive stars. In the last decade, X-ray observations revolutionized our perception of stellar winds but opened a Pandora's box of urgent problems. X-rays penetrating stellar winds suffer mainly continuum absorption, which greatly simplifies the radiative transfer treatment. The small and large scale structures i…
The peculiar O9.5V star BD+53°2790, the massive counterpart to the X-ray binary system 4U 2206+54
Blay, Pere; Reglero, Víctor
The X-ray binary system 4U 2206+54 hides many mysteries. Among them, the surprising behavior of both of its co components: the O9.5 dwarf star BD+53°2790 and a slowly rotating neutron star. BD+53°2790 misled the astronomers, exhibiting characteristics reminiscent of Be stars. However, a deeper spectral analysis and more intense monitoring revealed…