The spectral states of the NS LMXB 4U 1728-34: pictures from a wider scenario

Details The spectral states of the NS LMXB 4U 1728-34: pictures from a wider scenario The spectral states of the NS LMXB 4U 1728-34: pictures from a wider scenario

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..924..519f&link_type=abstract

THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. AIP Conference Proceedings, Volume 924, pp. 519-523

Computer Science

X-Ray Binaries, Neutron Stars, Spectroscopic Binaries, Close Binaries

Scientific paper

We present the broad-band spectrum of the atoll source 4U 1728-34 along its hardness intensity diagram performed with INTEGRAL. During its motion along the hardness-intensity diagram, the source passed trough two well distinct spectral states, i.e. from a hard to a soft state. In the hard state the source spectrum is well described by a simple thermal Comptonization model characterized by an electron temperature and opacity of kTe ~ 35 keV and τ ~ 0.5, respectively. In the soft state there is observed an additional soft thermal emission, modeled by a multicolour disk blackbody with a temperature kTbb ~ 0.6 keV. In this state the electron temperature drops to kTe ~ 3 keV, while the opacity increases to ~ 5. The hard spectral states observed for 4U 1728-34 can be considered as a part of a wider scenario of the spectral states experienced by LMXBs in which the relative importance of pure thermal and bulk (dynamic) Comptonization could be the main driving parameter.

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