J/A+A/503/541 Neutral Li in late-type stars non-LTE calculations (Lind+, 2009)
Departures from LTE for neutral Li in late-type stars.
Lind K., Asplund M., Barklem P.S.
<Astron. Astrophys. 503, 541 (2009)>
=2009A&A...503..541L 2009A&A...503..541L
ADC_Keywords: Stars, late-type ; Abundances ; Atomic physics
Keywords: stars: abundances - stars: late-type - line: formation
Abstract:
We perform non-LTE calculations of lithium in late-type stars for
a wide range of stellar parameters, including quantum mechanical
cross-sections for collisions with neutral hydrogen and the negative
hydrogen ion. Non-LTE abundance corrections for the lithium resonance
line at 670.7nm and the subordinate line at 610.3nm, are calculated
using 1D MARCS model atmospheres spanning a large grid in effective
temperature, surface gravity, and metallicity, and lithium abundance.
The competing effects of ultraviolet over-ionization and photon losses
in the resonance line govern the behaviour of the non-LTE effects with
stellar parameters and lithium abundance. The size and sign of the
non-LTE abundance corrections vary significantly over the grid for the
670.7nm line, but are typically positive and below 0.15dex for the
610.3nm line. The new collisional data play a significant role in
determining the abundance corrections.
Description:
Non-LTE abundance corrections and equivalent widths for atmospheric
models in the stellar parameter range Teff=[4000,8000]K,
log(g)=[1.0,5.0], [Fe/H]=[0.0,-3.0], and microturbulence
[1.0,5.0]km/s. The lithium abundance ranges between A(Li)=[-0.3,4.2].
An IDL-code for interpolation between table-values can be obtained on
request to klind(at)eso.org.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 47 5431 Non-LTE abundance corrections and equivalent
widths for the 670.7nm line
table3.dat 47 4388 Non-LTE abundance corrections and equivalent
widths for the 610.3nm line
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See also:
J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005)
J/A+A/503/545 : NGC 6397 Li depletion and Li-Na anti-correlation (Lind+, 2009)
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 K Teff Effective temperature
7- 9 F3.1 [cm/s2] logg Surface gravity
12- 15 F4.1 [Sun] [Fe/H] Metallicity
18- 20 F3.1 km/s Vturb Microturbulence velocity
23- 26 F4.1 [Sun] A(Li) LTE lithium abundance
29- 33 F5.2 [Sun] Delta Non-LTE abundance correction (1)
36- 40 F5.2 pm W(LTE) LTE equivalent width
43- 47 F5.2 pm W(NLTE) Non-LTE equivalent width
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Note (1): Corrections are given for equivalent widths in the range 0.01-100pm.
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Acknowledgements:
Karin Lind, klind(at)eso.org
(End) Karin Lind [ESO, Germany], Patricia Vannier [CDS] 02-Jun-2009