Search results for "AB Doradus moving group"

showing 3 items of 3 documents

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
researchProduct

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
researchProduct

Radio Emission from Binary Stars in the AB Doradus Moving Group

2015

AbstractPrecise determination of dynamical masses of pre-main-sequence stars is essential for calibrating stellar evolution models, that are widely used to derive theoretical masses of young low-mass objects. We have determined the individual masses of the pair AB Dor Ba/Bb using Australian Long Baseline Array observations and archive infrared data, as part of a larger program directed to monitor binary systems in the AB Doradus moving group. We have detected, for the first time, compact radio emission from both stars. This has allowed us to determine the orbital parameters of both the relative and absolute orbits and, consequently, their individual dynamical masses: 0.28±0.05 M⊙ and 0.25±0…

Orbital elementsPhysicsStarsSpace and Planetary ScienceInfraredBinary starBinary numberAstronomyAstronomy and AstrophysicsAstrophysicsStellar evolutionAB Doradus moving groupProceedings of the International Astronomical Union
researchProduct