Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330802s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #308.02; Bulletin of the American Astronomical Society, Vol. 41, p.279
Astronomy and Astrophysics
Astronomy
Scientific paper
Z-sources are low mass X-ray binaries containing accreting neutron stars
which emit luminous X-rays near Eddington luminosities (L_Edd). Their X-ray spectra change in a systematic Z-shaped pattern from the horizontal (HB), to the normal (NB), and
to the flaring branch (FB). Cyg X-2 is a prototype Z-source which we observed in X-rays twice along the entire X-ray spectral variation pattern at very high spectral resolution. We find a wealth of resolved and broad emission line features which we attribute to a hot accretion disk corona (ADC). The lines
have Doppler velocities between 400 and 2700 km/s, which place the origin of emission within 10^10 cm of the accretion disk. We also find evidence for a flux evolution along the Z-pattern. The line emissivities indicate that the source luminosity changes from about 0.7 L_Edd
in the HB to 2.6 L_Edd on the FB. The observed line flux evolution provides direct evidence for ongoing heating of the ADC along the spectral branches.
Canizares Calude R.
Huenemoerder David P.
Ji Liangliang
Nowak Michael
Schulz Norbert S.
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