Author: Erik Kuulkers

0000000000304115

AUTHOR

Erik Kuulkers

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On the Spectral Evolution of Cygnus X-2 along its Color-Color Diagram

2002

We report on the results of a broad band (0.1-200 keV) spectral study of Cyg X-2 using two BeppoSAX observations taken in 1996 and 1997, respectively, for a total effective on-source time of ~100 ks. The color-color (CD) and hardness-intensity (HID) diagrams show that the source was in the horizontal branch (HB) and normal branch (NB) during the 1996 and 1997 observation, respectively. Five spectra were selected around different positions of the source in the CD/HID, two in the HB and three in the NB. These spectra are fit to a model consisting of a disk blackbody, a Comptonization component, and two Gaussian emission lines at ~1 keV and ~6.6 keV, respectively. The addition of a hard power-…

PhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsColor–color diagramAstrophysicsRadiusHorizontal branchaccretion accretion disks / stars: individual: Cyg X–2 / stars: neutron / X-rays: stars / X-rays: binaries / X-rays: generalAstrophysicsSpectral lineLuminosityNOaccretionSpace and Planetary ScienceOptical depth (astrophysics)accretion disks / stars: individual: Cyg X–2 / stars: neutron / X-rays: stars / X-rays: binaries / X-rays: generalElectron temperatureEmission spectrum

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PEPhysical Sciences and Engineering
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