Search results for " binaries: general"

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Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808

2016

We report on the discovery of coherent pulsations at a period of 2.9 ms from the X-ray transient MAXI J0911-655 in the globular cluster NGC 2808. We observed X-ray pulsations at a frequency of $\sim339.97$ Hz in three different observations of the source performed with XMM-Newton and NuSTAR during the source outburst. This newly discovered accreting millisecond pulsar is part of an ultra-compact binary system characterised by an orbital period of $44.3$ minutes and a projected semi-major axis of $\sim17.6$ lt-ms. Based on the mass function we estimate a minimum companion mass of 0.024 M$_{\odot}$, which assumes a neutron star mass of 1.4 M$_{\odot}$ and a maximum inclination angle of $75^{\…

X-rays: binaries pulsars: general stars: neutron accretion accretion disks binaries: generalMetallicityAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesSettore FIS/05 - Astronomia E AstrofisicaPulsarMillisecond pulsar0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)010308 nuclear & particles physicsWhite dwarfAstronomy and Astrophysicsbinaries pulsars: general stars: neutron accretion accretion disks binaries: general [X-rays]Orbital periodNeutron starSpace and Planetary ScienceGlobular clusterAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaX-ray pulsar
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