Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-28
Mon.Not.Roy.Astron.Soc. 350 (2004) 587
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures, accepted for publication in MNRAS, corrected problem with references in previous version
Scientific paper
10.1111/j.1365-2966.2004.07667.x
We have performed simultaneous X-ray and optical spectroscopic observations of the Low Mass X-ray Binary Cygnus X-2. We have used a new data system attached to the Low Resolution Imaging Spectrograph instrument on Keck II to obtain spectra with a mean time resolution of 72.075 milliseconds, simultaneous with pointed X-ray observations using the PCA onboard XTE. In this paper, we have analysed the variability in both wavebands on timescales of 16 seconds. During our observations Cygnus X-2 covered all three branches of the Z-curve, allowing us to study how the changes in X-ray spectral state affect the optical emission. As the optical flux rises the X-ray intensity first rises on the Horizontal Branch (0
Gomer Richard
Horne Keith
O'Brien Kieran
Oke Bev J.
van der Klis Michiel
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