The AB Doradus System Revisited: The Dynamical Mass of AB Dor A
The AB Doradus System Revisited: The Dynamical Mass of AB Dor A
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重温 AB Doradus 系统:AB Doradus 的动态质量
DOI:
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发表时间:
2010
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通讯作者:
J. Reynolds
中科院分区:
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作者:
J. Guirado;I. Martí;J. Marcaide;L. Close;J. Lestrade;D. Jauncey;S. Jiménez;Dayton L. Jones;R. A. Preston;J. Reynolds
We report new radio interferometric observations of the quadruple premain-sequence (PMS) system AB Doradus. From these observations, combined with existing VLT near-infrared relative astrometry, we have refined the estimates of the dynamical masses of the system. In particular, we find component masses of 0:86 ̇ 0:09 Mˇ and 0:090 ̇ 0:003 Mˇ for AB Dor A and AB Dor C, respectively. These dynamical masses, coupled with temperatures and luminosities, allow for comparison with theoretical stellar models. The case of AB Dor C, in terms of calibration of evolutionary models of low-mass young stars has been widely reported J.C. Guirado, I. Martı́-Vidal, J.M. Marcaide, and S. Jiménez-Monferrer Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain e-mail: Jose.C.Guirado@uv.es, J.M.Marcaide@uv.es, sergio.jimenez@uv.es I. Martı́-Vidal Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany e-mail: imartiv@mpifr-bonn.mpg.de L.M. Close Steward Observatory, University of Arizona, Tucson, Arizona 85721, USA e-mail: lclose@as.arizona.edu J.-F. Lestrade Observatoire de Paris/LERMA, Rue de l’Observatoire 61, 75014 Paris, France e-mail: jean-francois.lestrade@obspm.fr D.L. Jauncey and J.E. Reynolds Australian Telescope National Facility, P.O. Box 76, Epping, NSW 2121, Australia e-mail: David.Jauncey@atnf.csiro.au, John.Reynolds@atnf.csiro.au D.L. Jones and R.A. Preston Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA e-mail: dayton.jones@jpl.nasa.gov, rap@sgra.jpl.nasa.gov J.M. Diego et al. (eds.), Highlights of Spanish Astrophysics V, Astrophysics and Space Science Proceedings, DOI 10.1007/978-3-642-11250-8 13, c Springer-Verlag Berlin Heidelberg 2010 139 140 J.C. Guirado et al. in previous studies. In this contribution, we compare the measured properties of AB Dor A with several solar-composition models for PMS stars. The models used in this comparison predict the dynamical mass to within the quoted uncertainties.