%\input{psfig.tex}
\def\defbox{\centerline}
%\def\defbox#1{ }

\sloppy		%line break latex p.88
\def\dcesam{{\sc cesam}}
\def\ivcesam{{\sc cesam4}}
\def\cesam2k{{\sc cesam2}{\em k}}
\def\dsdx#1#2{{\partial #1 \over \partial #2}} %d/dx
\def\dsdxx#1#2{{\partial^2 #1 \over \partial #2^2}} %d2/dx2
\def\dsdxy#1#2#3{{\partial^2 #1 \over \partial #2 \partial #3}} %d2/dxdy
\def\ddx#1#2{{{\rm d} #1 \over {\rm d} #2}} %d/dx simple
\def\dddx#1#2{{{\rm d^2} #1 \over {\rm d} #2^2}} %d2/dx2
\def\dpar#1#2{{\partial #1/ \partial #2}}
\def\dsdt#1{\frac {D#1}{Dt}}
\def\dsdr#1{\frac{\partial#1}{\partial R}}
\def\dsdnu#1{\frac{\partial#1}{\partial\nu}}
\def\dsdmu#1{\frac{\partial#1}{\partial\mu}}
\def\Etal#1{{\it et al.}\ (\cite{#1})}	%avec  parentheses
\def\etal#1{{\it et al.}\ \cite{#1}}
\def\ie{{\it i.e.}\ }
\def\dsty{\displaystyle}
\def\nega{\!\!\!\!\!\!\!}
%\newcommand{\boite}[2]{\centering{\fbox{\rule{#1}{0cm}\rule{0cm}{#2}}}}

\def\mref#1{\protect{\rm \ref{#1}\ (Page\ \pageref{#1})}}
%\def\mref#1{(\protect\ref{#1})}
\def\fig#1{Fig.\,~\mref{#1}}
\def\Fig#1{Figure\,~\mref{#1}}
\def\figur#1{figure\,~\mref{#1}}
\def\Lfig#1{La figure\,~\mref{#1}}
\def\lfig#1{la figure\,~\mref{#1}}
\def\tab#1{Table\,~\mref{#1}}
\def\eq#1{Eq.\,~\mref{#1}}
\def\equ#1{�quation\,~\mref{#1}}
\def\cfequ#1{\cf\ �quation\,~\mref{#1}}
\def\eqs#1{�quations\,~\mref{#1}}
\def\Eq#1{Equation\,~\mref{#1}}
\def\Leq#1{L'�quation\,~\mref{#1}}
\def\lleq#1{l'�quation\,~\mref{#1}}
\def\sec#1{Sect.\,~\mref{#1}}
\def\Sec#1{Section\,~\mref{#1}}
\def\Cha#1{Chapitre\,~\mref{#1}}
\def\cha#1{Chap.\,~\mref{#1}}
\def\chap#1{chapitre\,~\mref{#1}}
\def\paragr#1{\S\,\mref{#1}}
\def\cfparagr#1{\cf\ \S\,\mref{#1}}
\def\Paragr#1{Paragraphe\,~\mref{#1}}
\def\tot{{\rm tot}}
\def\ext{{\rm ext}}
\def\LoD{{\rm d}}
\def\obs{{\rm obs}}
\def\rmc{{\rm calc}}
\def\bib{\par\noindent\hangindent=3mm\hangafter=1}
\def\Box{\raisebox{.5ex}{\framebox[1ex]{}}}
\def\respt#1{({\it respt.\ }#1)}
\def\eg{{\it e.g.\ }}
\def\etc{{\it etc...\ }}
\def\noi{\noindent}
\def\loc{{\it op. cit.\ }}
\def\cf{{\it cf.\ }}
\def\EOS{�quation\ d'�tat}
\def\opa{opacit�}
\def\reac{r�actions thermonucl�aires}
\def\MS{s�quence\ principale}
\def\PMS{pr�-\MS}
\def\PtMS{post-\MS}
\def\COHE{combustion\ de\ l'h�lium}
\def\COCA{combustion\ du\ carbone}
\def\COOX{combustion\ de\ l'oxyg�ne}
\def\ZAMS{\MS\ d'\^age\ z�ro}
\def\hZAMS{\ZAMS\ homog\`ene}
\def\hPMS{\PMS\ homog\`ene}
\def\ZR{zone\ radiative}
\def\ZRs{zones\ radiatives}
\def\ZC{zone\ convective}
\def\ZCs{zones\ convectives}
\def\ZRZC{\ZR\ / \ZC}
\def\ZRZCs{\ZRs\ / \ZCs}
\def\ZCZR{\ZC\ / \ZR}
\def\ZCZRs{\ZCs\ / \ZRs}
\def\H#1{$^{#1}$H}
\def\He#1{$^{#1}$He}
\def\Be#1{$^{#1}$Be}
\def\Li#1{$^{#1}$Li}
\def\C#1{$^{#1}$C}
\def\N#1{$^{#1}$N}
\def\O#1{$^{#1}$O}
\def\Ne#1{$^{#1}$Ne}
\def\B#1{$^{#1}$B}
\def\F#1{$^{#1}$F}
\def\Fe#1{$^{#1}$Fe}
\def\Si#1{$^{#1}$Si}
\def\Mg#1{$^{#1}$Mg}
\def\Na#1{$^{#1}$Na}
\def\Al#1{$^{#1}$Al}
\def\P#1{$^{#1}$P}
\def\So#1{$^{#1}$S}
\def\Pgaz{P_{\rm gaz}}
\def\Ptot{P_{\rm tot}}
\def\Prad{P_{\rm rad}}
\def\Pth{P_{\rm th}}
\def\Ptur{P_{\rm tur}}
\def\gradad{\nabla_{\rm ad}}
\def\gradrad{\nabla_{\rm rad}}
\def\gradmu{\nabla_\mu}
\def\Hp{H_{\rm p}}
\def\Teff{$T_{\rm eff}$}
\def\bv{Brunt-V�iss�l�}
\def\fbv{fr�quence\ de\ \bv}
\def\embf{\bf\em}
\def\lsf{\large\sf}
\def\todayf{\number\day\space\ifcase\month\or
Janvier\or F\'evrier\or Mars\or Avril\or Mai\or Juin\or
Juillet\or Ao\^ut\or Septembre\or Octobre\or Novembre\or 
D\'ecembre\fi\space\number\year .}

\def\preambule{\if@twocolumn
\section*{Pr�ambule}
\else \small 
\begin{center}
{\bf Pr�ambule\vspace{-.5em}\vspace{0pt}} 
\end{center}
\quotation 
\fi}
\def\endpreambule{\if@twocolumn\else\endquotation\fi}
\def\PB#1{\makebox[0in][r]{\fbox{\bf PB}}\ \tt #1\rm}

\def\loa{\mathrel{\mathchoice {\vcenter{\offinterlineskip\halign{\hfil
$\displaystyle##$\hfil\cr<\cr\approx\cr}}}
{\vcenter{\offinterlineskip\halign{\hfil$\textstyle##$\hfil\cr
<\cr\approx\cr}}}
{\vcenter{\offinterlineskip\halign{\hfil$\scriptstyle##$\hfil\cr
<\cr\approx\cr}}}
{\vcenter{\offinterlineskip\halign{\hfil$\scriptscriptstyle##$\hfil\cr
<\cr\approx\cr}}}}}
\def\goa{\mathrel{\mathchoice {\vcenter{\offinterlineskip\halign{\hfil
$\displaystyle##$\hfil\cr>\cr\approx\cr}}}
{\vcenter{\offinterlineskip\halign{\hfil$\textstyle##$\hfil\cr
>\cr\approx\cr}}}
{\vcenter{\offinterlineskip\halign{\hfil$\scriptstyle##$\hfil\cr
>\cr\approx\cr}}}
{\vcenter{\offinterlineskip\halign{\hfil$\scriptscriptstyle##$\hfil\cr
>\cr\approx\cr}}}}}

