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New X-ray detections of known Wolf-Rayet stars
Yael Naze, Eric Gosset, Quentin Marechal
Using XMM-Newton, we undertook a dedicated project to search for X-ray bright wind-wind collisions in 18 WR+OB systems. We complemented these observations with Swift and Chandra da…
Correlated X-ray and optical variability in the O-type supergiant zeta Puppis
Joy S. Nichols, Yael Naze, David P. Huenemoerder +11
Analysis of the recent long exposure Chandra X-ray observation of the early-type O star zeta Pup shows clear variability with a period previously reported in optical photometric st…
Similar but different: the varied landscape of Onfp/Oef stars variability
Gregor Rauw, Yael Naze
The Oef category gathers rapidly rotating and evolved O-stars displaying a centrally reversed He II 4686 emission line. The origin of the variability of their photospheric and wind…
TESS lightcurves of gamma-Cas stars
Yael Naze, Gregor Rauw, Andrzej Pigulski
gamma-Cas stars constitute a subgroup of Be stars showing unusually hard and bright X-ray emission. In search for additional peculiarities, we analyzed the TESS lightcurves of 15 g…
Irregular emission cycles in the Oe star HD 60848
Gregor Rauw, Yael Naze, Fran Campos +2
We analyse the spectroscopic and photometric variability of the Oe star HD 60848 over the last twenty five years. The spectra reveal recurrent, but irregular cycles of increased ci…
Search for non-thermal X-ray emission in the colliding wind binary Cyg OB2 #8A
E. Mossoux, J. M. Pittard, G. Rauw +1
Cyg OB2 #8a is a massive O-type binary displaying strong non-thermal radio emission. Owing to the compactness of this binary, emission of non-thermal X-ray photons via inverse Comp…