2019MNRAS.488.5014A


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.27CET22:55:47

2019MNRAS.488.5014A - Mon. Not. R. Astron. Soc., 488, 5014-5019 (2019/October-1)

On the ultra-compact nature of the neutron star system 1RXS J170854.4-321857: insights from X-ray spectroscopy.

ARMAS PADILLA M. and LOPEZ-NAVAS E.

Abstract (from CDS):

The relatively small family of ultra-compact X-ray binary systems is of great interest for many areas of astrophysics. We report on a detailed X-ray spectral study of the persistent neutron star low-mass X-ray binary 1RXS J170854.4-321857. We analysed two XMM-Newton observations obtained in late 2004 and early 2005 when, in agreement with previous studies, the system displayed an X-ray luminosity (0.5-10 keV) of ∼1×1036 erg∼s–1. The spectrum can be described by a Comptonized emission component with Γ ∼ 1.9 and a distribution of seed photons with a temperature of ∼0.23 keV. A prominent residual feature is present at soft energies, which is reproduced by the absorption model if overabundances of Ne and Fe are allowed. We discuss how similar observables, which might be attributed to the peculiar (non-solar) composition of the plasma donated by the companion star, are a common feature in confirmed and candidate ultra-compact systems. Although this interpretation is still under debate, we conclude that the detection of these features along with the persistent nature of the source at such low luminosity and the intermediate-long burst that it displayed in the past confirms 1RXS J170854.4-321857 as a solid ultra-compact X-ray binary candidate.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - stars: individual: 1RXS J170854.4-321857 - stars: neutron - X-rays: binaries

Simbad objects: 9

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Number of rows : 9

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* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 505 1
2 4U 0919-54 LXB 09 20 26.4814865475 -55 12 24.507988707 20.40 21.30 21.0     ~ 144 0
3 4U 1246-58 LXB 12 49 39.364 -59 05 14.68   19.24 18.99     ~ 77 0
4 V* QU TrA LXB 15 47 54.6 -62 34 06           ~ 127 0
5 V* LU TrA LXB 16 01 02.3 -60 44 18 18.35 19.05 18.6     ~ 79 0
6 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 522 1
7 IGR J17062-6143 LXB 17 06 16.2874822889 -61 42 40.568398724           ~ 55 0
8 4U 1705-32 LXB 17 08 54.40 -32 18 57.5           ~ 50 0
9 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 229 1

    Equat.    Gal    SGal    Ecl

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2020.02.27-22:55:47

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