2011A&A...526A..64R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:01:33

2011A&A...526A..64R - Astronomy and Astrophysics, volume 526A, 64-64 (2011/2-1)

Detecting emission lines with XMM-Newton in 4U 1538-52.

RODES-ROCA J.J., PAGE K.L., TORREJON J.M., OSBORNE J.P. and BERNABEU G.

Abstract (from CDS):

The properties of the X-ray emission lines are a fundamental tool for studying the nature of the matter surrounding the neutron star and the phenomena that produce these lines. The aim of this work is to analyse the X-ray spectrum of 4U 1538-52 obtained by the XMM-Newton observatory and to look for the presence of diagnostic lines in the energy range 0.3-11.5keV. We used a 54 ks PN & MOS/XMM-Newton observation of the high-mass X-ray binary 4U 1538-52 covering the orbital phase between 0.75 to 1.00 (the eclipse ingress). We modelled the 0.3-11.5keV continuum emission with three absorbed power laws and looked for the emission lines. We found previously unreported recombination lines in this system at ∼2.4keV, ∼1.9keV, and ∼1.3keV, which is consistent with the presence of highly ionized states of S XV Heα, Si XIII Heα, and either Mg Kα or Mg XI Heα. On the other hand, in spectra that are both out of eclipse and in eclipse, we detect a fluorescence iron emission line at 6.4keV, which is resolved into two components: a narrow (σ≤10eV) fluorescence Fe Kα line plus one hot line from highly photoionized Fe XXV. The detection of new recombination lines during eclipse ingress in 4U 1538-52 indicates that there is an extended ionized region surrounding the neutron star.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - pulsars: individual: 4U 1538-52

Simbad objects: 5

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Number of rows : 5

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* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1373 0
2 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4       O9III/Veq 994 0
3 V* QV Nor HXB 15 42 23.3633078550 -52 23 09.576918639   16.3 14.5     B0.2Ia:e 372 1
4 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 524 1
5 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 756 1

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:01:33

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