J/A+A/541/A143 NLTE Corrections of the Ca lines (Spite+, 2012)
NLTE determination of the calcium abundance and 3D corrections in
extremely metal-poor stars.
Spite M., Andrievsky S.M., Spite F., Caffau E., Korotin S.A., Bonifacio P.,
Ludwig H.-G., Francois P., Cayrel R.
<Astron. Astrophys. 541, A143 (2012)>
=2012A&A...541A.143S 2012A&A...541A.143S
ADC_Keywords: Abundances ; Line Profiles
Keywords: line: formation - line: profiles - stars: abundances -
supernovae: general - Galaxy: evolution
Abstract:
Extremely metal-poor stars contain the fossil records of the chemical
composition of the early Galaxy and it is important to compare Ca
abundance with abundances of other light elements, that are supposed
to be synthesized in the same stellar evolution phases.
The NLTE profiles of the calcium lines were computed with a modified
version of the program MULTI, which allows a very good description of
the radiation field.
Description:
The NLTE corrections were computed for 51 CaI lines and 16 CaII
lines for a grid of models with different metallicities from
[Fe/H]=0.0 to [Fe/H]=-3. These corrections must be added to the LTE
value of [Ca/H], they were computed only if the equivalent width of
the Ca line was stronger than 3mÅ. In the tables the model is given
in the form (Teff, logg, [Fe/H], [Ca/Fe]) where Teff is the effective
temperature, and logg the logarithm of the surface gravity)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 36 1407 NLTE corrections for a grid of models with [Fe/H]=+0.0
tablea2.dat 36 402 NLTE corrections for a grid of models with [Fe/H]=-1.0
tablea3.dat 36 1608 NLTE corrections for a grid of models with [Fe/H]=-2.0
tablea4.dat 36 1206 NLTE corrections for a grid of models with [Fe/H]=-3.0
tablea5.dat 36 1273 NLTE corrections for a grid of models with [Fe/H]=-3.5
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Byte-by-byte Description of file: tablea[12345].dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 0.1nm lambda [3900/12000] Wavelength of the line (Å)
10- 14 A5 --- Ion Species (Ca I or Ca II)
16- 19 I4 K T [4750/7000] Temperature
21 I1 [cm/s2] logg [1/4] Surface gravity
23- 26 F4.1 [Sun] [Fe/H] [-3.5/0] Metallicity
28- 30 F3.1 [Sun] [Ca/Fe] [0/0.3] Ca abundance
32- 36 F5.2 --- Corr ?=- NLTE corrections (NLTE-LTE)
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Acknowledgements:
Monique Spite, monique.spite(at)obspm.fr
(End) Patricia Vannier [CDS] 29-Mar-2012