Search results for "Intermediate polar"

showing 4 items of 4 documents

Mass Accretion Processes in Young Stellar Objects: Role of Intense Flaring Activity

2014

According to the magnetospheric accretion scenario, young low-mass stars are surrounded by circumstellar disks which they interact with through accretion of mass. The accretion builds up the star to its final mass and is also believed to power the mass outflows, which may in turn have a significant role in removing the excess angular momentum from the star-disk system. Although the process of mass accretion is a critical aspect of star formation, some of its mechanisms are still to be fully understood. On the other hand, strong flaring activity is a common feature of young stellar objects (YSOs). In the Sun, such events give rise to perturbations of the interplanetary medium. Similar but mo…

Angular momentumMHDStars: flareAstrophysics::High Energy Astrophysical PhenomenaYoung stellar objectFOS: Physical sciencesInterplanetary mediumAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAcoustics and UltrasonicAccretion accretion diskIntermediate polarAstrophysics::Solar and Stellar AstrophysicsX-rays: starSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsNuclear and High Energy PhysicGeneral Environmental SciencePhysicsRadiationStar formationAstronomyAccretion (astrophysics)StarsAstrophysics - Solar and Stellar Astrophysicslcsh:TA1-2040Space and Planetary ScienceStars: circumstellar matterGeneral Earth and Planetary SciencesCircumstellar dustAstrophysics::Earth and Planetary Astrophysicslcsh:Engineering (General). Civil engineering (General)Stars: pre-main-sequenceActa Polytechnica CTU Proceedings
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Accretion disk coronae of intermediate polar cataclysmic variables

2017

Context. Intermediate polar cataclysmic variables (IPCV) contain a magnetic, rotating white dwarf surrounded by a magnetically truncated accretion disk. To explain their strong flickering X-ray emission, accretion has been successfully taken into account. Nevertheless, observations suggest that accretion phenomena might not be the only process behind it. An intense flaring activity occurring on the surface of the disk may generate a corona, contribute to the thermal X-ray emission, and influence the system stability. Aims. Our purposes are: investigating the formation of an extended corona above the accretion disk, due to an intense flaring activity occurring on the disk surface; studying t…

Magnetohydrodynamics (MHD)Stars: flareAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesMagnetosphereAstrophysics01 natural scienceslaw.inventionAccretion accretion diskSettore FIS/05 - Astronomia E AstrofisicaIntermediate polarlaw0103 physical sciencesRadiative transferAstrophysics::Solar and Stellar AstrophysicsStars: coronaeX-rays: star0101 mathematics010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsNovae cataclysmic variableWhite dwarfAstronomy and AstrophysicsAstronomy and AstrophysicThermal conductionAccretion (astrophysics)010101 applied mathematicsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceAstrophysics::Earth and Planetary AstrophysicsMagnetohydrodynamicsAstrophysics - High Energy Astrophysical PhenomenaFlareAstronomy & Astrophysics
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Effects of Flaring Activity on Dynamics of Accretion Disks in YSOs

2009

We investigate the effects of strong flares on the accretion phenomena in YSOs. Among all classical assumptions, the model accounts magnetic-field oriented thermal conduction. We study the global dynamics of the system for two positions of the heating release triggering the flare.

PhysicsAccretion (meteorology)stars: X-raysStars: flareAstrophysics::High Energy Astrophysical PhenomenaDynamics (mechanics)AstronomyAstrophysicsThermal conductionlaw.inventionSettore FIS/05 - Astronomia E AstrofisicaIntermediate polarAccretion disclawAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Galaxy AstrophysicsFlare
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Fallback accretion onto magnetized neutron stars and the hidden magnetic field model

2015

The observation of several neutron stars with relatively low values of the surface magnetic field found in supernova remnants has led in recent years to controversial interpretations. A possible explanation is the slow rotation of the proto-neutron star at birth which is unable to amplify its magnetic field to typical pulsar levels. An alternative possibility, the hidden magnetic field scenario, seems to be favoured over the previous one due to the observation of three low magnetic field magnetars. This scenario considers the accretion of the fallback of the supernova debris onto the neutron star as the responsible for the observed low magnetic field. In this work, we have studied under whi…

PhysicsHistoryAstrophysics::High Energy Astrophysical PhenomenaMagnetosphereAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsMagnetarAccretion (astrophysics)Computer Science ApplicationsEducationMagnetic fieldNeutron starSupernovaIntermediate polarPulsarAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsJournal of Physics: Conference Series
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