2016A&A...591A..41P


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST00:08:25

2016A&A...591A..41P - Astronomy and Astrophysics, volume 591A, 41-41 (2016/7-1)

Broadband observations of the X-ray burster 4U 1705-44 with BeppoSAX.

PIRAINO S., SANTANGELO A., MUCK B., KAARET P., DI SALVO T., D'AI A., IARIA R. and EGRON E.

Abstract (from CDS):

Context. 4U1705-44 is one of the most-studied type I X-ray burster and Atoll sources. This source represents a perfect candidate to test different models proposed to self-consistently track the physical changes occurring between different spectral states because it shows clear spectral state transitions.
Aims. The broadband coverage, the sensitivity and energy resolution of the BeppoSAX satellite offers the opportunity to disentangle the components that form the total X-ray spectrum and to study their changes according to the spectral state.
Methods. Using two BeppoSAX observations carried out in August and October 2000, respectively, for a total effective exposure time of ∼100ks, we study the spectral evolution of the source from a soft to hard state. Energy spectra are selected according to the source position in the color-color diagram (CCD).
Results. We succeeded in modeling the spectra of the source using a physical self-consistent scenario for both the island and banana branches (the double Comptonization scenario). The components observed are the soft Comptonization and hard Comptonization, the blackbody, and a reflection component with a broad iron line. When the source moves from the banana state to the island state, the parameters of the two Comptonization components change significantly and the blackbody component becomes too weak to be detected.
Conclusions. We interpret the soft Comptonization component as emission from the hot plasma surrounding the neutron star, hard Comptonization as emission from the disk region, and the blackbody component as emission from the inner accretion disk. The broad feature in the iron line region is compatible with reflection from the inner accretion disk.

Abstract Copyright: © ESO, 2016

Journal keyword(s): accretion, accretion disks - stars: individual: 4U 1705-44 - stars: neutron - X-rays: stars - X-rays: binaries - X-rays: general

Status at CDS:  

CDS comments: Regions B1 to B3 not in SIMBAD.

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1697 1
2 [KRL2007b] 214 LXB 17 00 58.46 -46 11 08.6           ~ 201 0
3 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 354 0
4 IGR J17480-2446 LXB 17 48 04.831 -24 46 48.87           ~ 149 0
5 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 688 1
6 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 286 0
7 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3904 0
8 NAME Galactic Bulge reg ~ ~           ~ 3362 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-00:08:25

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