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Young, active radio...
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Azulay, R.Universitat de Valencia,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
Young, active radio stars in the AB Doradus moving group
- Article/chapterEnglish2017
Publisher, publication year, extent ...
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2017-06-12
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EDP Sciences,2017
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:a3659f58-40ca-4772-9e65-374e5eb70b6e
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https://research.chalmers.se/publication/252258URI
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https://doi.org/10.1051/0004-6361/201629899DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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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 European VLBI Network (EVN) at 8.4 GHz the stars HD 160934, EK Dra, PW And, and LO Peg. We also observed some of these stars with the near-infrared CCD AstraLux camera at the Calar Alto observatory to complement the radio observations. Results. We determine model-independent dynamical masses of both components of the star HD 160934, A and c, which are 0.70 ± 0.07 Mâ and 0.45 ± 0.04 Mâ, respectively. We revised the orbital parameters of EK Dra and we determine a sum of the masses of the system of 1.38 ± 0.08 Mâ. We also explored the binarity of the stars LO Peg and PW And. Conclusions. We found observational evidence that PMS evolutionary models underpredict the mass of PMS stars by 10%-40%, as previously reported by other authors. We also inferred that the origin of the radio emission must be similar in all observed stars, that is, extreme magnetic activity of the stellar corona that triggers gyrosynchrotron emission from non-Thermal, accelerated electrons.
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Guirado, J. C.Universitat de Valencia
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Marcaide, J. M.Universitat de Valencia
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Marti-Vidal, Ivan,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mivan
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Ros, EduardoUniversitat de Valencia,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Tognelli, E.Universita di Pisa,University of Pisa,Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics
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Hormuth, F.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Ortiz, J. L.Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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Universitat de ValenciaMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG)
(creator_code:org_t)
Related titles
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In:Astronomy and Astrophysics: EDP Sciences6020004-63611432-0746
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