Disentangling the Z and Atoll sources: results from a NS LMXB survey with INTEGRAL

Details Disentangling the Z and Atoll sources: results from a NS LMXB survey with INTEGRAL Disentangling the Z and Atoll sources: results from a NS LMXB survey with INTEGRAL

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1379..217s&link_type=abstract

ASTROPHYSICS OF NEUTRON STARS 2010: A Conference in Honor of M. Ali Alpar. AIP Conference Proceedings, Volume 1379, pp. 217-218

Astronomy and Astrophysics

Astrophysics

X-Ray Sources (Astronomical), Spectral Analysis, Plasma, Data Analysis, X-Ray Sources, X-Ray Bursts, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Magnetohydrodynamics And Plasmas, Data Analysis: Algorithms And Implementation, Data Management

Scientific paper

We have investigated the spectral and temporal evolution of Neutron Star Low-Mass X-ray Binaries (NS LMXBs) using a sample of eight bright sources. INTEGRAL spectra from 2003 to 2009 and some near-simultaneous RXTE and Swift spectra have been fitted with the recently developed thermal and bulk Comptonization model compTB. In this proposed scenario, the transient hard X-ray tails exhibited by the Z sources and GX 13+1 are connected to efficient bulk motion Comptonization in the inner Transition Layer (TL), while the lack of a tail could be due to too low or too high local accretion rates. Another difference between the source types--the long-term modulation of the Atoll source light curves (with the notable exception of GX 13+1)--is seen to be mostly independent of spectral evolution, while presumably driven by changes in the overall accretion rate from the companion.

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