Article (Scientific journals)
Proper use of Schwarzschild Ledoux criteria in stellar evolution computations
Gabriel, Maurice; Noels-Grötsch, Arlette; Montalbán, J. et al.
2014In Astronomy and Astrophysics, 569, p. 63
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Keywords :
convection; stars: interiors; stars: evolution; methods: numerical
Abstract :
[en] The era of detailed asteroseismic analyses opened by space missions such as CoRoT and Kepler has highlighted the need for stellar models devoid of numerical inaccuracies, in order to be able to diagnose which physical aspects are being ignored or poorly treated in standard stellar modeling. We tackle here the important problem of fixing convective zone boundaries in the frame of the local mixing length theory. First we show that the only correct way to locate a convective zone boundary is to find, at each iteration step, through interpolations or extrapolations from points within the convective zone, the mass where the radiative luminosity is equal to the total luminosity. We then discuss two misuses of the boundary condition and the ways they affect stellar modeling and stellar evolution. The first consists in applying the neutrality condition for convective instability on the radiative side of the convective boundary. The second way of misusing the boundary condition comes from the process of fixing the convective boundary through the search for a change of sign of a possibly discontinuous function. We show that these misuses can lead to completely wrong estimates of convective core sizes with important consequences for the following evolutionary phases. We point out the advantages of using a double mesh point at each convective zone boundary. The specific problem of a convective shell is discussed and some remarks concerning overshooting are given.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gabriel, Maurice 
Noels-Grötsch, Arlette ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Montalbán, J.;  Institut d'Astrophysique et de Géophysique, Liège University, Allée du 6 Août, 17, 4000, Liège, Belgium
Miglio, A.;  School of Physics and Astronomy, University of Birmingham, , Birmingham, B15 2TT, UK )
Language :
English
Title :
Proper use of Schwarzschild Ledoux criteria in stellar evolution computations
Publication date :
01 September 2014
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
569
Pages :
63
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 06 February 2015

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