Search results for " pulsars: individual:IGR J17498-2921"

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The discovery of the 401 Hz accreting millisecond pulsar IGR J17498-2921 in a 3.8 h orbit

2011

We report on the detection of a 400.99018734(1) Hz coherent signal in the Rossi X-ray Timing Explorer light curves of the recently discovered X-ray transient, IGR J17498-2921. By analysing the frequency modulation caused by the orbital motion observed between August 13 and September 8, 2011, we derive an orbital solution for the binary system with a period of 3.8432275(3) hr. The measured mass function, f(M_2, M_1, i)=0.00203807(8) Msun, allows to set a lower limit of 0.17 Msun on the mass of the companion star, while an upper limit of 0.48 Msun is set by imposing that the companion star does not overfill its Roche lobe. We observe a marginally significant evolution of the signal frequency …

High Energy Astrophysical Phenomena (astro-ph.HE)PhysicsAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsLight curveSpectral lineNeutron starOrbitSettore FIS/05 - Astronomia E AstrofisicaSpace and Planetary ScienceMillisecond pulsarOrbital motionAstrophysics::Solar and Stellar AstrophysicsRoche lobeAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical Phenomenaneutron stars: rotation pulsars: individual:IGR J17498-2921 X-rays: binaries [stars]stars: neutron stars: rotation pulsars: individual:IGR J17498-2921 X-rays: binariesNoise (radio)

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