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BANYAN. IV. Fundamental parameters of low-mass star candidates in nearby young stellar kinematic groups - Isochronal Age determination using Magnetic evolutionary models
Université de Montréal.
Université de Montréal.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (Theoretical Astrophysics)ORCID iD: 0000-0002-2012-7215
Université de Montréal.
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2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 792, no 1, 37- p.Article in journal (Refereed) Published
Abstract [en]

Based on high resolution optical spectra obtained with ESPaDOnS at CFHT, we determine fundamental parameters (\Teff, R, \Lbol, \logg\ and metallicity) for 59 candidate members of nearby young kinematic groups. The candidates were identified through the BANYAN Bayesian inference method of \citet{2013malo}, which takes into account the position, proper motion, magnitude, color, radial velocity and parallax (when available) to establish a membership probability. The derived parameters are compared to Dartmouth Magnetic evolutionary models and to field stars with the goal to constrain the age of our candidates. We find that, in general, low-mass stars in our sample are more luminous and have inflated radii compared to older stars, a trend expected for pre-main sequence stars. The Dartmouth Magnetic evolutionary models show a good fit to observations of field K and M stars assuming a magnetic field strength of a few kG, as typically observed for cool stars. Using the low-mass members of βPictoris moving group, we have re-examined the age inconsistency problem between Lithium Depletion age and isochronal age (Hertzspring-Russell diagram). We find that the inclusion of the magnetic field in evolutionary models increase the isochronal age estimates for the K5V-M5V stars. Using these models and field strengths, we derive an average isochronal age between 15 and 28 Myr and we confirm a clear Lithium Depletion Boundary from which an age of 26±3~Myr is derived, consistent with previous age estimates based on this method.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2014. Vol. 792, no 1, 37- p.
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Astronomy with specialization in Astrophysics
URN: urn:nbn:se:uu:diva-228581DOI: 10.1088/0004-637X/792/1/37ISI: 000341172100037OAI: diva2:734390
Available from: 2014-07-17 Created: 2014-07-17 Last updated: 2015-08-13Bibliographically approved

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