Search results for "European VLBI Network"

showing 3 items of 3 documents

Young, active radio stars in the AB Doradus moving group

2017

Context. Precise determination of stellar masses is necessary to test the validity of pre-main-sequence (PMS) stellar evolutionary models, whose predictions are in disagreement with measurements for masses below 1.2 M. To improve such a test, and based on our previous studies, we selected the AB Doradus moving group (AB Dor-MG) as the best-suited association on which to apply radio-based high-precision astrometric techniques to study binary systems. Aims. We seek to determine precise estimates of the masses of a set of stars belonging to the AB Dor-MG using radio and infrared observations. Methods. We observed in phase-reference mode with the Very Large Array (VLA) at 5 GHz and with the Eur…

European VLBI NetworkInfraredFOS: Physical sciencesContext (language use)Astrophysics01 natural sciencesRadio continuum: generalObservatorypre-main sequence [Stars]0103 physical sciencesBinaries: general010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)PhysicsOrbital elementsgeneral [Binaries]010308 nuclear & particles physicsgeneral [Radio continuum]Astronomy and AstrophysicsAstrometryCoronaStarsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceStars: pre-main sequenceAB Doradus moving group
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Radio detection of the young binary HD 160934

2013

Precise determination of dynamical masses of pre-main-sequence (PMS) stars is essential to calibrate stellar evolution models that are widely used to derive theoretical masses of young low-mass objects. Binary stars in young, nearby loose associations are particularly good candidates for this calibration since all members share a common age. Interestingly, some of these young binaries present a persistent and compact radio emission, which makes them excellent targets for astrometric VLBI studies. We aim to monitor the orbital motion of the binary system HD 160934, a member of the AB Doradus moving group. We observed HD 160934 with the Very Large Array and the European VLBI Network at 8.4 an…

Orbital elementsPhysicsEuropean VLBI NetworkAstrophysics::Instrumentation and Methods for AstrophysicsFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsStarsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceVery-long-baseline interferometryOrbital motionBinary starAstrophysics::Solar and Stellar AstrophysicsStellar evolutionAstrophysics::Galaxy AstrophysicsSolar and Stellar Astrophysics (astro-ph.SR)AB Doradus moving group
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15 years of very long baseline interferometry observations of two compact radio sources in Messier 82

2006

We present the results of a second epoch of 18cm global Very Long-Baseline Interferometry (VLBI) observations, taken on 23 February 2001, of the central kiloparsec of the nearby starburst galaxy Messier 82. These observations further investigate the structural and flux evolution of the most compact radio sources in the central region of M82. The two most compact radio objects in M82 have been investigated (41.95+575 and 43.31+592). Using this recent epoch of data in comparison with our previous global VLBI observations and two earlier epochs of European VLBI Network observations we measure expansion velocities in the range of 1500-2000km/s for 41.95+575, and 9000-11000km/s for 43.31+592 usi…

PhysicsEuropean VLBI NetworkEpoch (reference date)FluxAstronomy and AstrophysicsAstrophysicsMessier objectGalaxySupernovasymbols.namesakeInterferometrySpace and Planetary ScienceVery-long-baseline interferometrysymbolsMonthly Notices of the Royal Astronomical Society
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