HAL Id: tel-00269053
https://tel.archives-ouvertes.fr/tel-00269053
Submitted on 2 Apr 2008
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Astérosismologie des étoiles de type solaire. Test de composition chimique et de structure interne.
Applications aux étoiles centrales de système planétaire.
Marion Laymand
To cite this version:
Marion Laymand. Astérosismologie des étoiles de type solaire. Test de composition chimique et de structure interne. Applications aux étoiles centrales de système planétaire.. Astrophysique [astro-ph].
Université Paul Sabatier - Toulouse III, 2008. Français. �tel-00269053�
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dt = − ∇ ~ p + ρ ~ f
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dρ dt
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ξ ˜ r (r)
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ξ r
YLo
I8%/L/F%&*-@J5-_,:$'bw%@J1E:$,1H<:$%&*48:$,.+5<=0% 5jP%@85j/*-:,)6
k h =
√ l(l+1) R
:; 8@G5-P%/"e$:$,125TEF&:$*-54o
"!#$8:$%@%&8@=I:,1+;R,<:$'bw%@>125-*-W,P12,:`8;<1KA`;<*=0&@8,.=0%
548H=*$5-H:$,R
| m | ≤ l
o9;0,1
l = 0
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l
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!`*-,,,CK548K'(=54*4/;<18
ξ ˜ r (r)
]p ˜ 0 (r)
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^
]=0% :$'('7:`1*4&Fo8^FAC;0+/*4:$,DQF8%&*g!$,C
54:$%&P6
dξ r
dr = − ( 2 r + 1
Γ 1 p dp
dr )ξ r + 1 ρc 2 ( S l 2
ω 2 − 1)p 0 + l(l + 1)
ω 2 r 2 φ 0
N 2 o2!= Ydp 0
dr = ρ(ω 2 − N 2 )ξ r + 1 Γ 1 p
dp
dr p 0 − ρ dφ 0 dr
N 2 o54
^ Y
1 r 2
d
dr (r 2 dΦ 0
dr ) = 4πG( p 0 c 2 + ρξ r
g N 2 ) + l(l + 1)
r 2 φ 0
N 2 o54 2 Yρ 0 = ρ
Γ 1 p p 0 + ρξ r ( 1 Γ 1 p
dp dr − 1
ρ dρ
dr )
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:$;n/*-AC;28%/L/F%&*-n/*4A`;<>:$;R%@F8AC;,8B1B'bw
S l
]01F0,<*->=0%26
S l 2 = l(l + 1)c 2
r 2 = k h 2 c 2
N 2 o54 Y5-k%&F8AC;,8S1 B_% <,Cn|}h&%*-'%5(%
N 2
6N 2 = g( 1 Γ 1 p
dp dr − 1
ρ dρ
dr )
N 2 o54?:CY\26
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ω 2
8n_%@F85T]+Q@_tB1*4%&KAC;
ω
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N ==0%@*4&*-:$,1Q:$,<18/YLo
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!&
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@J1<*43(8*45-K1EF/;<1*-%q'G_8'(P"!89;,<9==<%&:`9ne`'7=<&:/*4AC;o ,)1*4'7*4,`;<5OQ:%&1%@G1;
nefn/#'7KW$%&8t>5TQ==%@:"m<*4')/*-:,k1Gr_:!7K5-*4,W>AC;*08:$,<&*-n/t>,F8W5-*-W8%^548D=?8%@&;%&w+/*4:$,
1;R=?:/,C&*-5W$%/"!`*4/+/*4:$,,5
Φ 0
o8KF8AC;0/*-:,K1!`*-,,,CP54:$%&>6
dξ r
dr = − ( 2 r − 1
Γ 1
H p − 1 )ξ r + 1 ρc 2 ( S l 2
ω 2 − 1)p 0
N 2 o54 6 Ydp 0
dr = ρ(ω 2 − N 2 )ξ r − 1 Γ 1
H p − 1 p 0
N 2 o54 8 Y:3R
H p −1 = − d ln p/dr
9,<_5-"+_1E:$&*-545j+&*-:$, 1Q:%&1%@P%/+1*j50F5-L!$F]f5-i:$,</*4:$,i=%&:=%&q!+%&*48,.qwI8;f|
:$;=c=5-;<J%/=<*-1'7,CJA`;<>5-8HAC;0+,C&*4&F8Ktb5TEF8AC;*45-*4w%&+o<D,c=%&'7*4#8%@>==%@:"m<*4')/*-:,]C5-
nefn/#'721L!f*48,.S6
dξ r
dr = 1 ρc 2 ( S l 2
ω 2 − 1)p 0
N 2 o54 9 Ydp 0
dr = ρ(ω 2 − N 2 )ξ r
N 2 o54
< Y
r_nefn/#'71QFA`;+/*4:$,=?8;<QF8%@*-%&7&:$;<b5jc:$%&'(71Q;,<F8AC;0+&*-:$, 1*[IF8%@8,./*485-54
1;R&8:$,<1:$%@1%&6
d 2 ξ r dr 2 = ω 2
c 2 (1 − N 2 ω 2 )( S l
ω 2 − 1)ξ r
N 2 o54 = Y
df:$*gH8,<8:$%@76
d 2 ξ r
dr 2 = − K (r)ξ r
N 2 o3^ Y
:3R
K(r) = ω 2 c 2 ( N 2
ω 2 − 1)( S l
ω 2 − 1)
,1<*-@&*-,W;91;fmR"26
df*
K(r) < 0
]ξ r
;W$'(8,./iLmf=?:$,,C&*-5-5-'7,.\:;S1*4'7*4,C;DLmf=?:$,8,.&*-8545-'7,C8o9,
B826
| N | < | ω | < S l
:$;
S l < | ω | < | N |
df*
K (r) > 0
]ξ r
@;,2:$,L/*-:,M:$&*-5-5-,./91<B%ov9,KB826| ω | > | N |
| ω | > S l
60'(:f1<8H=
| ω | < | N |
L| ω | < S l
60'7:`18HW
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1 B_% ,.@|Th %*4%5%)6
ω N
o ,R=?8;<1:$,<BF8%@*-%&6K(r) ∼ 1
c 2 (ω 2 − S l 2 )
N 2 oX2 YS1<e`,0+'7*4A`;<G1G8J'7:`1q@J=<%&*-,<8*-=5-'7,Cl1<F/%&'(*-,FG=%_5-2!+%@*j+&*-:$,15j
!`*4&8@&1;{&:$,{8,
r
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K(r)
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=5-,8o
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, !`; =<%&F8F81'7'(8,.BAC;(5j=;54/+&*-:$, 18B'7:`18>@S"%&&F8%@*-&F=0%2;,
!+548;%^&85-54KA`;<
| ω | > S l
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=*4F8W$F10,~;,l%&FW$*-:,B1<q5OQFL/:$*45-^@*4/;<F8l8,./%@DV;,B=I:$*4,.1q%@&:$;%&,<8'(8,.@lL 5-J&;%n8
1B5TEF&:$*-54N =%K%&FWLmf*-:$,0YLov8G=I:$*4,./K12%&L/:$;%@,8'(8,.G18G:$,1G:$%&%@8@=I:$,<18,.>+;fm
F8%&:1<
K(r)
o2%/"e$:$,R1;R=I:*-,.K12%&L/:$;%@,8'(8,.8]
r t
]0&285-;5-2t=0%n/*4%H125jb%&5j+&*-:$, 6ω = S l =
p l(l + 1)c
r t ⇒ r t =
p l(l + 1)c ω
N 2 o 4$Y
8:$'(=I:/,./2%&1*j+5-P1<;,:'bw%&21E:$,1<B@F8W$5-2tRN1 =<%
2 o
X2 YP6
k r 2 = ω 2 − S l 2 c 2
N 2 o
$
Y
d<7!+548;%G1*-'(*-,C;S"!$b5j(=%&::,18;<%b6I5-(&%/a@/:*-%&S1b5OQ:$,<1k71:$,k&8,1,8
tB&9:$;%&w?8%>N0W$;<%&
2 o4$Yo<k=<%&::$,<18;%q')m<*4')+5-HAC;E85-54P=?8;<J+&&8*4,1%&G8n
r t
of[D5-;
\29
2 o2
# # ! # ! ! #
!" # # ! '%$ ' # !& ! ' # # ! ( *),+ #-
. # !%/
S l
!l =
021#3 #546& 7 ', ! !!
098:8
µ
; # ! ! < ! 098:8:8µ
; # 3 ## !&
o
5-S!+5-;%J1
l
8@H +*-w54]ft;<,9%&FA`;<8,S1:,,F8+]=54;H5jS!+548;%_1r t
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@:$,1%=<%&::$,<1F8'(8,.5TE*-,./F%&*48;%J1<B5OQFL/:$*45-+o
(' '= 3 5
%&F8AC;,871=;54/+&*-:$, 18B'7:`18>@B*-,fF8%&*48;%@tM5j%&FA`;<8,71GB_% ,.@|
h&%*-'%5(%<of[\:;%K18:f1<%&8K%&1*j+;fmMW$%&,1]0:$,R
ω 2 S l 2
L @ =I;<8EF8%&*-%@6K(r) ∼ l(l + 1) r 2 ( N 2
ω 2 − 1)
N 2 o :CY71<e`,0+'7*4A`;<S1B8P'(:f1<88@G1:$'(*-,<F8B=0%
N 2
]vE8n>t(1*-%@S=0+%5-(W%/"!`*4/F+o?l,@&*4'7*45j,. @7N%Y t>;,,:'bw%&_1Q:,1].:,(:w</*48,.D5j9'G_8'(J%@85j/*-:,kAC;K=I:;%D18D:,18
12W$%&"!f*g/F+o0G,R'7:`19W(8n;,2&;=?8%@=I:&*4&*-:$,c1E:$,1<8K12W$%/"!`*4&Fo
==?85-:,HAC;25jb%&FA`;<8,S1 B_% ,.@|Th %*4%5%b8@1FL0,*4B=%>6
N 2 = g( 1 Γ 1 p
dp dr − 1
ρ
dρ
dr )
2 o54
## ! # # # ! / 9 !6 #! 7) ' # !
! # !& # !:( )
l = 30
1ν = 3
; # '!# )l = 100
1ν = 3
; ,& # ' #) '! &# # # ## !& # ''
1 3 8:8 4
df*
N 2 ≥ 0
]I5-:$%@d ln(p)/d ln(ρ) ≥ 1/Γ 1
od`* :$, *4')+W$*-,2;,<bw;545-B1b'7+/*4#8%&BAC;*'(:$,./c!$%&M5j{&;%n 81 5OQFL/:$*45-]D5OQ [L)1< 5j{W$%/"!`*4&F@c54:$%&(=54;)W$%&,1A`;< 5j
=?:$;@&F8P*-,1;<*4/G=0%q5- W;*-1G8,.!`*-%@:$,,0,.BN5jB=I:$;<&&F91ExP%@*-'(#81"YG6`5jkw;<5-5-%&L!`*-8,.
t/=?:$&*g/*4:$,*-,<*4/*-5-+]C18K:$@8*-545j+&*-:$,<_;f/:$;%H1<B5-k=?:$&*g/*-:,M1QFAC;*-54*-w%@>==0+%/*4&&,."o
UV5eM(1:,2=%&:$=W.+&*-:$,1Q:$,<1o
df*
N 2 ≤ 0
]+5-:$%@G:$, 75j7@*4&;0+/*4:$,*4,.!$8%@&+o)w;545-B,b%&L!`*-8,.>=>t)&=I:$@*4&*-:$,*4,*4&*j54(65-b'(:$;<!8'(8,.28nk+'7=54*40FS2;,<(:$,1:$,.!$/*4:$,==0%&-8o8>:,18
12W$%&"!f*g/F>AC;*@B=<%&:$=0+W$8,.Gt5TE*-,./F%&*-;%J1B8L&&B:$,2&:,CFL!+,8@88,.&88o
G:$,1*g/*-:,
N 2 ≤ 0
F8AC;*4!+;f^;k8%&*g/#%&i1Hdf7_%&&*45-1=?:$;%~5TQ==0+%&*4&*-:$,>1Q;,<:$,2128:$,.!8&*-:$,o
9,<J5-G"J1Q:$@8*45-5j/*-:,N
N 2 ≥ 0
Y]f5-S%@85j/*-:, N 2 o :CYi,:;J*-,<1*-AC;AC;2 :$%&%@8n|=?:$,1Rt5jb%&FAC;8,S'7mf*-'754PAC;2=I;<!$,.>+@/8*4,1%@>5-8H:,1812W$%& !`*g/Fo
r_8'(:f1K&:$,.G1:$,28;`m;&@*=*-FW$F8K10,<G;,<B:$,B1B5TEF/:*-5-bNL 0W$;<%&)N
2 o2 Y&Yo
8S=I:*-,./B1)%@&:$;%&,<8'(8,.b:$%&%@8&=?:$,1<8,.t5-R:$,1*g/*4:$,
N = ω
o9,<b5-"+k1FL/:$*45-8l1Ve`=IJ&:$5-*-%@8].*-5vLmf*-n/G18;fm7=?:$*-,.&q1G%&L/:$;%@,8'(8,.P6`;<,=%&:`G1;8,./%&
LK;,t5jbw&2125j:$,28:$,.!8&*4!o
PG:$,<18KW(,Q:,CK=K8,:$%&BF&FB1<F/&F88G10,K548HF&:$*-548H1>Ve`=?B@:$5j+*-%&+o
(' ' 3 5
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