Low-energy line emission from Cygnus X-2 observed by the BeppoSAX LECS

Details Low-energy line emission from Cygnus X-2 observed by the BeppoSAX LECS Low-energy line emission from Cygnus X-2 observed by the BeppoSAX LECS

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..683k&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 683-686 (1997).

Computer Science

X-Ray Binaries, Neutron Stars, X-Ray

Scientific paper

We present a 0.2-10 keV spectrum of the low-mass X-ray binary Cygnus X-2 obtained using the Low Energy Concentrator Spectrometer on-board BeppoSAX. The spectrum can be described by a cut-off power-law model with absorption of (2.28+/-0.07)×1021 atoms cm-2, a power-law index of 0.78+/-0.02 and a cut-off energy of 4.30+/-0.08 keV (68% confidence errors), except at energies near ~1 keV where excess emission is present. This can be modeled by a broad Gaussian line feature with an energy of 1.02+/-0.04 keV, a full width half-maximum of 0.47+/-0.07 keV and an equivalent width of 74+/-1125 eV. This result confirms earlier reports of line emission near 1 keV and shows the intensity and structure of the feature to be variable. For a more detailed account of these observations we refer to Kuulkers et al. [4].

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