Detection of 26Hz quasi-periodic oscillations in the flaring branch of CygnusX-2.

Details Detection of 26Hz quasi-periodic oscillations in the flaring branch of CygnusX-2. Detection of 26Hz quasi-periodic oscillations in the flaring branch of CygnusX-2.

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...303..801k&link_type=abstract

Astronomy and Astrophysics, v.303, p.801

Astronomy and Astrophysics

Astrophysics

25

Accretion, Accretion Disks, Binaries: Close, Stars: Individual: Cygx-2, Stars: Neutron, X-Rays: Stars

Scientific paper

We report the detection of 26Hz quasi-periodic oscillations during an 800s intensity dip in the low-mass X-ray binary CygX-2 in the flaring branch state. The quasi-periodic oscillations have properties that are different from those of flaring branch quasi-periodic oscillations seen in other "Z" sources, which are often ascribed to oscillations in a radial inflow of matter. The fact that the 26Hz quasi-periodic oscillations occur during a dip suggests that they arise in a medium that partially obscures the X-ray emission. We interpret the new quasi-periodic oscillations phenomenon in terms of a model involving a radial flow and a thick, torus-like inner disk.

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