Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4233r&link_type=abstract
American Astronomical Society, HEAD meeting #11, #42.33; Bulletin of the American Astronomical Society, Vol. 41, p.730
Other
Scientific paper
We continue to find physical insights about atoll and Z sources by using a low-Comptonization spectral model for their soft states. In this decomposition, most of the radiation is thermal emission from two components: the accretion disk and the hotter boundary layer on the neutron star surface. Spectral analyses with RXTE then imply that atoll sources have nearly constant inner disk radius, consistent with a termination at the ISCO. This picture is largely confirmed in recent observations with Suzaku. On the other hand, Z sources show inner disk radii that increase with luminosity, suggesting the workings of the local Eddington limit. The flaring and normal branches can be understood as radius and advection instabilities, respectively, that disturb the Eddington-inflated disk. Patterns of spectral evolution are used to confirm the classification of GX13+1 as a Z source. We discuss implications for the origin of kHz QPOs. Finally, we compare the luminosity evolution of accreting black holes and neutron stars. This research was supported by NASA.
Homan Jeroen
Lin Dacheng
Remillard Ronald A.
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