Article (Scientific journals)
Towards an effective asteroseismology of solar-like stars: time-dependent convection effects on pulsation frequencies
Grigahcène, A.; Dupret, Marc-Antoine; Sousa, S. G. et al.
2012In Monthly Notices of the Royal Astronomical Society, 422, p. 43
Peer Reviewed verified by ORBi
 

Files


Full Text
grig.pdf
Publisher postprint (205.34 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
asteroseismology; convection; Sun: oscillations; stars: oscillations
Abstract :
[en] Since the early days of helioseismology, adiabatic models have shown their limits for a precise fitting of individual oscillation frequencies. This discrepancy, which also exists for solar-type stars, is known to originate near the surface superadiabatic convective region where the interaction between oscillations and convection is likely to have a large effect on the frequencies. We present an asteroseismic study to address the adequacy of time-dependent convection (TDC) non-adiabatic models to better reproduce the observed individual frequencies. We select, for this purpose, three solar-like stars, in addition to the Sun, to which we fit the observed frequencies in a grid of TDC non-adiabatic models. The best model selection is done by applying a maximum likelihood method. The results are compared to pure adiabatic and near-surface corrected adiabatic models. We show that, first, TDC models give very good agreement for the mode frequencies and average lifetimes. In the solar case, the frequency discrepancy is reduced to <1.75 μHz over 95 per cent of the modes considered. Secondly, TDC models give an asteroseismic insight into the usually unconstrained ad hoc stellar parameters, such as the mixing-length parameter α[SUB]MLT[/SUB].
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Grigahcène, A.;  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
Dupret, Marc-Antoine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Sousa, S. G.;  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
Monteiro, M. J. P. F. G.;  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal
Garrido, R.;  Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, 18080 Granada, Spain
Scuflaire, Richard ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA)
Gabriel, M.;  Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17-B 4000 Liège, Belgium)
Language :
English
Title :
Towards an effective asteroseismology of solar-like stars: time-dependent convection effects on pulsation frequencies
Publication date :
01 May 2012
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
422
Pages :
L43
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 January 2013

Statistics


Number of views
61 (3 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
12
Scopus citations®
without self-citations
9
OpenCitations
 
12

Bibliography


Similar publications



Contact ORBi