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XMM-Newton observations of two black hole X-ray transients in quiescence
J. -M. Hameury, D. Barret, J. -P. Lasota +5
We report on XMM-Newton observations of GRO J1655-40 and GRS 1009-45, which are two black hole X-ray transients currently in their quiescent phase. GRO J1655-40 was detected with a…
No observational proof of the black-hole event-horizon
Marek A. Abramowicz, Wlodek Kluzniak, Jean-Pierre Lasota
Recently, several ways of obtaining observational proof of the existence of black-hole horizons have been proposed. We argue here that such proof is fundamentally impossible: obser…
VY Sculptoris stars as magnetic CVs
Jean-Marie Hameury, Jean-Pierre Lasota
We show that the absence of outbursts during low states of VY Scl stars is easily explained if white dwarfs in these systems are weakly magnetized ($μ\gta 5 10^{30}$ G cm). H…