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High-speed Keck II and RXTE spectroscopy of Cygnus X-2: (I) Three X-ray components revealed by correlated variability | K. O’Brien
; Keith Horne
; Richard Gomer
; J. B. Oke
; M. van der Klis
; | Date: |
28 Dec 2003 | Journal: | Mon.Not.Roy.Astron.Soc. 350 (2004) 587 | Subject: | astro-ph | Abstract: | 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 | Source: | arXiv, astro-ph/0401586 | Services: | Forum | Review | PDF | Favorites |
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