NICER data of Cygnus X-2 show a fast HBO-to-NBO QPO transition with an unchanged disc and a significant drop in Comptonizing optical depth.
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Fast Transitions of X-ray Variability in the Neutron Star Low Mass X-ray Binary Cygnus X-2
NICER data of Cygnus X-2 show a fast HBO-to-NBO QPO transition with an unchanged disc and a significant drop in Comptonizing optical depth.