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Title: | Asteroseismic masses, ages, and core properties of gamma Doradus stars using gravito-inertial dipole modes and spectroscopy | Authors: | Mombarg, J. S. G. Van Reeth, T. Pedersen, M. G. MOLENBERGHS, Geert Bowman, D. M. Johnston, C. Tkachenko, A. AERTS, Conny |
Issue Date: | 2019 | Publisher: | OXFORD UNIV PRESS | Source: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 485(3), p. 3248-3263 | Abstract: | The asteroseismic modelling of period spacing patterns from gravito-inertial modes in stars with a convective core is a high-dimensional problem. We utilize the measured period spacing pattern of prograde dipole gravity modes (acquiring Pi(0)), in combination with the effective temperature (Teff) and surface gravity (log g) derived from spectroscopy, to estimate the fundamental stellar parameters and core properties of 37 gamma Doradus (gamma Dor) stars whose rotation frequency has been derived from Kepler photometry. We use two 6D grids of stellar models, one with step core overshooting and another with exponential core overshooting, to evaluate correlations between the three observables Pi(0), T-eff, and log g and the mass, age, core overshooting, metallicity, initial hydrogen mass fraction, and envelope mixing. We provide multivariate linear model recipes relating the stellar parameters to be estimated to the three observables (Pi(0), T-eff, log g). We estimate the (core) mass, age, core overshooting, and metallicity of gamma Dor stars from an ensemble analysis and achieve relative uncertainties of similar to 10 per cent for the parameters. The asteroseismic age determination allows us to conclude that efficient angular momentum transport occurs already early on during the main sequence. We find that the nine stars with observed Rossby modes occur across almost the entire main-sequence phase, except close to core-hydrogen exhaustion. Future improvements of our work will come from the inclusion of more types of detected modes per star, larger samples, and modelling of individual mode frequencies. | Notes: | [Mombarg, J. S. G.; Van Reeth, T.; Pedersen, M. G.; Bowman, D. M.; Johnston, C.; Tkachenko, A.; Aerts, C.] Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium. [Van Reeth, T.] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia. [Van Reeth, T.] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark. [Molenberghs, G.] Univ Hasselt, I BioStat, Martelarenlaan 42, B-3500 Hasselt, Belgium. [Molenberghs, G.] Katholieke Univ Leuven, I BioStat, Kapucijnenvoer 35, B-3000 Leuven, Belgium. [Aerts, C.] Radboud Univ Nijmegen, IMAPP, Dept Astrophys, POB 9010, NL-6500 GL Nijmegen, Netherlands. | Keywords: | asteroseismology; methods: statistical; stars: fundamental parameters; stars: interiors; stars: oscillations;asteroseismology; methods: statistical; stars: fundamental parameters; stars: interiors; stars: oscillations | Document URI: | http://hdl.handle.net/1942/29065 | ISSN: | 0035-8711 | e-ISSN: | 1365-2966 | DOI: | 10.1093/mnras/stz501 | ISI #: | 000474902000020 | Rights: | 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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mombarg 1.pdf Restricted Access | Published version | 2.86 MB | Adobe PDF | View/Open Request a copy |
Mombarg_et_al_2018_for_resubmission_180218-geert.pdf | Non Peer-reviewed author version | 2.46 MB | Adobe PDF | View/Open |
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