2018A&A...616L..17S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:53:49

2018A&A...616L..17S - Astronomy and Astrophysics, volume 616, L17-17 (2018/8-1)

XMM-Newton detection of the 2.1 ms coherent pulsations from IGR J17379-3747.

SANNA A., BOZZO E., PAPITTO A., RIGGIO A., FERRIGNO C., DI SALVO T., IARIA R., MAZZOLA S.M., D'AMICO N. and BURDERI L.

Abstract (from CDS):

We report the detection of X-ray pulsations at 2.1ms from the known X-ray burster IGR J17379-3747 using XMM-Newton. The coherent signal shows a clear Doppler modulation from which we estimate an orbital period of ∼1.9h and a projected semi-major axis of ∼8lt-ms. Taking into account the lack of eclipses (inclination angle of <75°) and assuming a neutron star mass of 1.4M, we have estimated a minimum companion star of ∼0.06M. Considerations on the probability distribution of the binary inclination angle make the hypothesis of a main-sequence companion star less likely. On the other hand, the close correspondence with the orbital parameters of the accreting millisecond pulsar SAX J1808.4-3658 suggests the presence of a bloated brown dwarf. The energy spectrum of the source is well described by a soft disk black-body component (kT∼0.45keV) plus a Comptonisation spectrum with photon index ∼1.9. No sign of emission lines or reflection components are significantly detected. Finally, combining the source ephemerides estimated from the observed outbursts, we obtained a first constraint on the long-term orbital evolution of the order of Porb=(-2.5±2.3)x10–12s/s.

Abstract Copyright: © ESO 2018

Journal keyword(s): binaries: general - stars: neutron - X-rays: binaries - accretion, accretion disks

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* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 231 1
2 IGR J16597-3704 gam 16 59 32.90230 -37 07 14.2780           ~ 13 0
3 XTE J1737-376 HX? 17 37 59 -37 46.3           ~ 30 1
4 [PLV2002] CX1 LXB 17 48 52.163 -20 21 32.40           ~ 163 1
5 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 228 0
6 SWIFT J1756.9-2508 LXB 17 56 57.35 -25 06 27.8           ~ 91 0
7 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 197 0
8 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 870 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:53:49

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