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The X-ray emission of Be+stripped star binaries
Yael Naze, Gregor Rauw, Myron A. Smith +1
Using observations from Chandra, Swift and XMM-Newton, we investigate the high-energy properties of all known (18) Be+sdO systems as well as 7 additional Be binaries suspected to h…
Velocity monitoring of gamma-Cas stars reveals their binarity status
Yael Naze, Gregor Rauw, Stefan Czesla +2
The binary status of gamma-Cas stars has been discussed while theoretically examining the origin of their peculiar X-ray emission. However, except in two cases, no systematic radia…
Let there be more variability in two gamma Cas stars
Yael Naze, Andrzej Pigulski, Gregor Rauw +1
We investigate the short-term optical variability of two gamma Cas analogs, pi Aqr and BZ Cru, thanks to intensive ground-based spectroscopic and space-borne photometric monitoring…
Three discoveries of gamma Cas analogs from dedicated XMM-Newton observations of Be stars
Yael Naze, Christian Motch, Gregor Rauw +5
In the last years, a peculiarity of some Be stars - their association with unusually hard and intense X-ray emission - was shown to extend beyond a mere few cases. In this paper, w…
Ultraviolet Activity as indicator of Small-scale Magnetic Fields in gamma Cassiopeiae
Myron A. Smith
The recorded activity of gamma Cas (B0.5 IVe) in the ultraviolet is important to an understanding of the mechanism behind this prototypical Be star's high energy activity, especial…
The X-ray emission of the gamma Cassiopeiae stars
Myron A. Smith, R. Lopes de Oliveira, C. Motch
Long considered as the "odd man out" among X-ray emitting Be stars, γCas (B0.5e IV) is now recognized as the prototype of a class of stars that emit hard thermal X-rays. Our classi…