Computer Science
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..275h&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Computer Science
X-Ray Binaries, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Supergiant Stars
Scientific paper
AX J1845.0-0433 is a persistent X-ray binary with a O9.5I supergiant companion emitting at a low 0.2-100 keV luminosity of 1035 ergs-1 with seldom flares reaching luminosities of 1036 ergs-1. Variability factors of 50 are observed on short time-scales of a few ks. The broad-band, high-energy spectrum is typical of wind-fed accreting pulsars (absorption NH = (2.6+/-0.2)1022 cm-2, hard continuum Γ = (0.7-0.9)+/-0.1, high-energy cutoff Ecut = 16-3+5 keV). An excess at low energies is also observed (fitted with black body KT = 0.18+/-0.05 keV). Optically-thin and highly-ionised iron (Fe XVIII-XIX) located near the NS (<~0.4 R*) is also observed. No spectral variations are observed between the flare and quiescence phases except the luminosity and the absorption depth of the iron 7.9 keV edge. The flare characteristics, in contrast to the persistent quiescent emission, suggest that clumps are formed within the stellar wind of the supergiant companion.
Walter Robert
Zurita Heras Juan A.
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