Mid-infrared photometry of the T Tauri triple system with kernel phase interferometry
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status: published
Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating...
HD49330 is a Be star that underwent an outburst during its five-month observation with the CoRoT satellite. An analysis of its light curve revealed several independent p and g pulsation modes, in addition to showing that the amplitude of the modes is directly correlated with the outburst. We modelled the results obtained with CoRoT. We modelled the...
Is HR 6819 a triple system containing a black hole?: An alternative explanation
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status: published
Investigating the lack of main-sequence companions to massive Be stars
status: published
TESS light curves of γ Cas stars
γ Cas stars constitute a subgroup of Be stars showing unusually hard and bright X-ray emission. In search for additional peculiarities, we analysed the TESS light curves of 15 γ Cas analogues. Their periodograms display broad frequency groups and/or narrow isolated peaks, often superimposed over red noise. The detected signals appear at low frequen...
The "hidden" companion in LB-1 unveiled by spectral disentangling
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status: published
Let there be more variability in two γ Cas stars
We investigate the short-term optical variability of two γ Cas analogues, πAqr and BZ Cru, thanks to intensive ground-based spectroscopic and space-borne photometric monitorings. For both stars, low-amplitude (mmag) coherent photometric variability is detected. The associated signals display long-term amplitude variations, as in other Be stars. How...
The young massive SMC cluster NGC 330 seen by MUSE: I. Observations and stellar content
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A majority of massive stars are part of binary systems, a large fraction of which will inevitably interact during their lives. Binary-interaction products (BiPs), i.e. stars affected by such interaction, are expected to be commonly present in stellar populations. BiPs are thus a crucial ingredient in the understanding of stellar evolution. We aim t...
Immobilization of Be-Containing HLW in the Aluminophosphate Glass Matrix: The Results of the Investigation and Experienc...
...Published in Glass Physics and Chemistry
Abstract—The melting process of aluminophosphate and boro-alumino-phosphate glass containing up to 5.63 wt % of beryllium oxide is studied. The viscosity and electrical conductivity of the melts are studied. The entrainment of beryllium in the steam-gas phase during glass melting is studied. The homogeneity of beryllium distribution over the glass ...
Surprises in the simultaneous X-ray and optical monitoring of π Aquarii
To help constrain the origin of the peculiar X-ray emission of γ Cas stars, we conducted a simultaneous optical and X-ray monitoring of π Aqr in 2018. At that time, the star appeared optically bright and active, with a very strong Hα emission. Our monitoring covers three 84 d orbital cycles, allowing us to probe phase-locked variations as well as l...
