J/MNRAS/448/2332 Hydrogen Lyman and Balmer line profiles (Pelisoli+, 2015)
Unified line profiles for hydrogen perturbed by collisions with protons:
satellites and asymmetries.
Pelisoli I., Santos M.G., Kepler S.O.
<Mon. Not. R. Astron. Soc., 448, 2332-2343 (2015)>
=2015MNRAS.448.2332P 2015MNRAS.448.2332P (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Line Profiles ; Photometry, hydrogen-line ;
Balmer lines
Keywords: atomic data - line: profiles - white dwarfs
Abstract:
We present new calculations of unified line profiles for hydrogen
perturbed by collisions with protons. We report on new calculations of
the potential energies and dipole moments which allow the evaluation
of profiles for the lines of the Lyman series up to Lyman δ and
the Balmer series up to Balmer 10. Unified calculations only existed
for the lines Lyman α to Lyman γ and Balmer α
including the H2+ quasi-molecule. These data are available as
online material accompanying this paper and should be included in
atmosphere models, in place of the Stark effect of protons, since the
quasi-molecular contributions cause not only satellites, but large
asymmetries that are unaccounted for in models that assume that Stark
broadening of electrons and that of protons are equal.
Description:
There are basically four possible approaches for the calculation of
collisional profiles: the impact theory, the quasi-static approximation
(statistical theory), the unified theory and the quantum method. We chose
the unified theory as proposed by Allard et al. (1999PhRvA..60.1021A 1999PhRvA..60.1021A)
to the evaluations in this work. Calculations via unified theory existed in
the literature only for Lyman α (Allard et al. 2004A&A...424..347A 2004A&A...424..347A),
Lyman β (Allard et al. 1998A&A...330..782A 1998A&A...330..782A), Lyman γ
(Allard et al. 2009A&A...506..993A 2009A&A...506..993A) and Balmer α (Kielkopf et al.
2002EPJD...18...51K 2002EPJD...18...51K). For the other lines, calculations were done only
by Santos & Kepler (2012MNRAS.423...68S 2012MNRAS.423...68S), but via the quasi-static approach.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables1.dat 47 2103323 Profiles for the lines of the Lyman and Balmer
series
tables2.dat 69 5576 *Profiles already at an adequate format to be
read by the SYNSPEC code, with 697 data lines
and log(NH+)=17
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Note on tables2.dat:
The SYNSPEC code (Hubeny & Lanz, 2011ascl.soft09022H).
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See also:
II/63 : Balmer Lines Photometric Data (Mermilliod+ 1980)
VI/98 : Stark broadening of H lines (Stehle+, 1999)
Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
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1 I1 --- ni [1/2] Initial atomic state
3- 4 I2 --- nf [2/10] Final atomic state
6- 10 I5 K T [10000/25000] Temperature
12- 13 I2 [cm-3] log(NH+) [16/18] Log of perturber density
15- 22 F8.3 0.1nm lambda Wavelength (Å)
24- 34 E11.6 --- Ilambda1 Intensity at lambda (I(λ)) (1)
36- 47 E12.6 --- Ilambda2 Intensity at lambda (I(λ)) (2)
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Note (1): Considering the conversion :
I(λ)=2*iπ*clight*I(ω)/(λc*λc),
where λc is the central wavelength. Should be use to
implementation in model spectra codes, because they assume a constant
aλ=aω*λc2^_ when calculating the absorption
coefficient.
Note (2): Considering the exact conversion :
I(λ)=2*π*clight*I(ω)/(λ*λ).
Should be use when comparing the models directly to observed
experimental profiles.
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Byte-by-byte Description of file(#): tables2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda Wavelength (Å)
10- 20 E11.6 --- H2f ?=0 First-order profile for the H2
quasi-molecule (1)
22- 32 E11.6 --- H2s ?=0 Second-order profile for the H2
quasi-molecule (1)
34- 45 E12.6 --- H2+f First-order H2+ quasi-molecule profile
evaluated by us via unified theory
47- 57 E11.6 --- H2+s ?=0 Second-order H2+ quasi-molecule profile (2)
59- 69 E11.6 --- H2/H2+ ?=0 A combination between the H2 and H2+
profiles (1)
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Note (1): Filled by zeros here because we have not evaluated it.
Note (2): Which we did not evaluated because it does not seem to have an
observational effect.
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 23-Nov-2017