Hydrogen Lines in DA White Dwarfs: Improved Stark Broadening. PierEmmanuel Tremblay & Pierre Bergeron Université de Montréal. E. . +. Hydrogenline (DA) white dwarfs. Spectroscopic Technique : Bergeron et al. (1992). Photosphere at 20,000 K.
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Hydrogen Lines in DA White Dwarfs: Improved Stark Broadening
PierEmmanuel Tremblay & Pierre BergeronUniversité de Montréal
E

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Mihalas, Hummer & Däppen 1988Occupation probability formalism
Mihalas, Hummer & Däppen1988Occupation probability formalism
T=10,000 K
T=20,000 K
charged  neutral
WD0205+250"old models" priorto 1992
Mike Seaton (1990) : MHD88 effects should also be included in line profiles calculations.
Bergeron (1993) : adhoc parameter, used in all codes (TLUSTY)
VCS βcritx2
β=E/Eo
P(β)dβ
MHD88 : Holtsmark
Nayfonov (1999) : Hooper
r=R in line profiles calculations.debye
Vidal, Cooper & Smith (1973)Lemke (1997)
v
Ψ(H)
e
ρ
Constant Electric FieldLinear Stark Effect
H
Ψ(e)
r=Rmin
Nonadiabatic quantum calculations in line profiles calculations.
n=5
n=4
electronic collisions
noquenching
n=3
n=2
n=1
t
V(r) + qEz in line profiles calculations.
Hydrogen Atom : V(r)
V(z)
V(z)
z
z
Saddle point
ΔE
Energy of Nth level
Mihalas, Hummer & Däppen 1988 in line profiles calculations.Occupation probability formalism
Bound state
Free State
ΔE
High Fields
Low Fields
Seaton (1990) : first nonideal profiles using approximate electronic broadening profiles
Bergeron (1993) : adhoc parameter.
Wiese et al. (1972) in line profiles calculations.
Δ in line profiles calculations.Teff =+100 KΔlog g = +0.06
Independent constraints in line profiles calculations.