2018ApJ...853..150S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST07:38:48

2018ApJ...853..150S - Astrophys. J., 853, 150-150 (2018/February-1)

A study of low-mass X-ray binaries in the low-luminosity regime.

SONBAS E., DHUGA K.S. and GOGUS E.

Abstract (from CDS):

A recent study of a small sample of X-ray binaries (XRBs) suggests a significant softening of spectra of neutron star (NS) binaries as compared to black hole (BH) binaries in the luminosity range 1034-1037 erg s–1. This softening is quantified as an anticorrelation between the spectral index and the 0.5-10 keV X-ray luminosity. We extend the study to significantly lower luminosities (i.e., ∼a few x 1030 erg s–1) for a larger sample of XRBs. We find evidence for a significant anticorrelation between the spectral index and the luminosity for a group of NS binaries in the luminosity range 1032-1033 erg s–1. Our analysis suggests a steep slope for the correlation i.e., -2.12 ± 0.63. In contrast, BH binaries do not exhibit the same behavior. We examine the possible dichotomy between NS and BH binaries in terms of a Comptonization model that assumes a feedback mechanism between an optically thin hot corona and an optically thick cool source of soft photons. We gauge the NS-BH dichotomy by comparing the extracted corona temperatures, Compton-y parameters, and the Comptonization amplification factors: the mean temperature of the NS group is found to be significantly lower than the equivalent temperature for the BH group. The extracted Compton-y parameters and the amplification factors follow the theoretically predicted relation with the spectral index.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): methods: data analysis - stars: black holes - stars: neutron - X-rays: binaries - X-rays: binaries

VizieR on-line data: <Available at CDS (J/ApJ/853/150): table3.dat>

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 MAXI J0556-332 LXB 05 56 46.32 -33 10 28.2           ~ 75 0
2 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1052 0
3 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 737 0
4 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 677 1
5 CRTS J135716.8-093238 HXB 13 57 16.8357614768 -09 32 38.793867836           M4.5V 123 0
6 V* BW Cir HXB 13 58 09.700 -64 44 05.80 17.90 18.00 16.9     ~ 202 1
7 V* IL Lup HXB 15 47 08.2766679321 -47 40 10.284971214     11.96     ~ 426 1
8 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1062 0
9 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 849 1
10 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
11 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1751 1
12 MAXI J1659-152 LXB 16 59 01.680 -15 15 28.73           ~ 199 0
13 [KRL2007b] 214 LXB 17 00 58.46 -46 11 08.6           ~ 210 0
14 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1826 0
15 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 244 1
16 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 266 1
17 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 775 1
18 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 642 1
19 [PLV2002] CX1 LXB 17 48 52.163 -20 21 32.40           ~ 171 1
20 SAX J1750.8-2900 LXB 17 50 24.42 -29 02 15.4           ~ 131 0
21 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 366 1
22 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7     12.73     K5III 359 0
23 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 407 1
24 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 921 1
25 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 236 1
26 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1040 1
27 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1125 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-07:38:48

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