Simultaneous optical and X-ray high speed photometry of Cyg X-2

Details Simultaneous optical and X-ray high speed photometry of Cyg X-2 Simultaneous optical and X-ray high speed photometry of Cyg X-2

2003-10-21

arxiv.org/abs/astro-ph/0310615v1

Mon.Not.Roy.Astron.Soc. 347 (2004) 1217

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07297.x

The X-ray emission from X-ray binaries may originate in flares occurring when magnetic loops anchored in the disc reconnect. In analogy with our Sun, H alpha emission should arise as the accelerated electrons thermalize in the optically emitting disc, perhaps leading to correlated variability between X-rays, H alpha and the optical continuum. We present simultaneous X-ray and optical high speed photometry of the neutron star low-mass X-ray binary Cyg X-2 to search for such correlations. The highest time resolution achieved is 5 ms in white light and 100 ms with a 3 nm filter centred on H alpha. We find power on timescales > 100s (flickering) in optical with a total r.m.s. of a few %, about an order of magnitude less than that seen in X-rays. We do not find significant correlations between the X-ray and optical fluxes on short timescales, hence cannot conclude whether magnetic flares contribute significantly to the optical emission.

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