J/MNRAS/418/863 NLTE corrections for Mg and Ca lines (Merle+ 2011)
A grid of non-local thermodynamic equilibrium corrections for magnesium
and calcium in late-type giant and supergiant stars: application to Gaia
Merle T., Thevenin F., Pichon B., Bigot L.
<Mon. Not. R. Astron. Soc. 418, 863 (2011)>
=2011MNRAS.418..863M 2011MNRAS.418..863M
ADC_Keywords: Stars, late-type; Stars, giant; Stars, supergiant;
Stars, metal-deficient; Equivalent widths; Abundances; Atomic physics
Keywords: line: formation; radiative transfer; stars:abundances;
stars: atmospheres; stars: late-type
Abstract:
We investigate NLTE effects for magnesium and calcium in the
atmospheres of late-type giant and supergiant stars. The aim of this
paper is to provide a grid of NLTE/LTE equivalent width ratios W/W*
of Mg and Ca lines for the following range of stellar parameters: Teff
in [3500,5250]K, log(g) in [0.5,2.0]dex and [Fe/H] in [-4.0,0.5]dex.
We use realistic model atoms with the best physics available and
taking into account the fine structure. The Mg and Ca lines of
interest are in optical and near IR ranges. A special interest
concerns the lines in the Gaia spectrograph (RVS) wavelength domain
[847,874]nm. The NLTE corrections are provided as function of stellar
parameters in an electronic table as well as in a polynomial form for
the Gaia/RVS lines.
Description:
Non-LTE corrections for Mg and Ca lines in the stellar parameter range
Teff=[3500,5250]K, log(g)=[0.5, 2.0], [Fe/H]=[-4.0,0.5] and
[α/Fe]=[0.0,0.4]. The W/W* ratio can be applied to the measured
equivalent widths to determine NLTE abundance with classical LTE
radiative transfer codes. 45 files for 45 lines of MgI, CaI and CaII
are given. In each file, 453 rows at max for a grid of 453 model
atmospheres. Only models with W≥1mÅ are given. Only models with
0.0<W/W*=<5 are given. For the lines in the Gaia/RVS, the
gaia_lines.f90 code give the W/W* as a function of Teff, log(g) and
[Fe/H] using polynomial fits.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
mgi4167.dat 41 452 MgI 4167 Angstroem line
mgi4571.dat 41 427 MgI 4571 Angstroem line
mgi4702.dat 41 452 MgI 4702 Angstroem line
mgi4730.dat 41 389 MgI 4730 Angstroem line
mgi5167.dat 41 453 MgI 5167 Angstroem line
mgi5172.dat 41 453 MgI 5172 Angstroem line
mgi5183.dat 41 453 MgI 5183 Angstroem line
mgi5528.dat 41 452 MgI 5528 Angstroem line
mgi5711.dat 41 426 MgI 5711 Angstroem line
mgi7657.dat 41 400 MgI 7657 Angstroem line
mgi8473.dat 41 290 MgI 8473 Angstroem line
mgi8715.dat 41 303 MgI 8710, 8712 and 8717 Angstroem lines
mgi8736.dat 41 388 MgI 8736 Angstroem line
mgi8806.dat 41 452 MgI 8806 Angstroem line
mgi8923.dat 41 357 MgI 8923 Angstroem line
mgi8997.dat 41 310 MgI 8997 Angstroem line
mgi10312.dat 41 293 MgI 10312 Angstroem line
mgi11828.dat 41 452 MgI 11828 Angstroem line
cai4226.dat 41 453 CaI 4226 Angstroem line
cai4425.dat 41 453 CaI 4425 Angstroem line
cai4578.dat 41 415 CaI 4578 Angstroem line
cai5512.dat 41 416 CaI 5512 Angstroem line
cai5867.dat 41 362 CaI 5867 Angstroem line
cai6102.dat 41 445 CaI 6102 Angstroem line
cai6122.dat 41 453 CaI 6122 Angstroem line
cai6161.dat 41 396 CaI 6161 Angstroem line
cai6162.dat 41 453 CaI 6162 Angstroem line
cai6166.dat 41 400 CaI 6166 Angstroem line
cai6169a.dat 41 416 CaI 6169.03 Angstroem line
cai6169b.dat 41 433 CaI 6169.56 Angstroem line
cai6455.dat 41 396 CaI 6455 Angstroem line
cai6572.dat 41 401 CaI 6572 Angstroem line
cai7326.dat 41 429 CaI 7326 Angstroem line
cai8525.dat 41 236 CaI 8525 Angstroem line
cai8583.dat 41 262 CaI 8583 Angstroem line
cai8633.dat 41 274 CaI 8633 Angstroem line
caii3933.dat 41 453 CaII 3933 Angstroem line
caii3968.dat 41 453 CaII 3968 Angstroem line
caii8248.dat 41 344 CaII 8248 Angstroem line
caii8498.dat 41 453 CaII 8498 Angstroem line
caii8542.dat 41 453 CaII 8542 Angstroem line
caii8662.dat 41 453 CaII 8662 Angstroem line
caii8912.dat 41 399 CaII 8912 Angstroem line
caii9854.dat 41 286 CaII 9854 Angstroem line
caii119a.dat 41 423 CaII 11949 Angstroem line
gaia_lin.f90 150 283 Interpolation of W/W* for Gaia lines as
functions of Teff, log(g) and [Fe/H]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 K Teff [3500/5250] Effective temperature
7- 9 F3.1 [cm/s2] logg [0.5/2] Surface gravity
11- 15 F5.2 [Sun] [Fe/H] [-4/0.5] Metallicity
18- 21 F4.2 [Sun] [a/Fe] [0/0.4] Enhancement of α elements (1)
23- 29 I7 0.1pm W NLTE equivalent width in Angstrom (2)
32- 35 F4.2 --- W/W* NLTE/LTE equivalent width (3)
37- 41 F5.2 [Sun] Delta ? NLTE abundance correction (4)
--------------------------------------------------------------------------------
Note (1): [α/Fe] = [α/H] - [Fe/H]
Note (2): computed with LTE abundance value, given only if W≥0.1pm (1mÅ)
Note (3): NLTE/LTE ratios W/W* given in the range 0--5
Note (4): Δ[El/H] = [El/H]NETL - [El/H]ETL
--------------------------------------------------------------------------------
Author's address:
Thibault Merle <thibault.merle(at)oca.eu>
History:
* 04-May-2012: Prepared by Thibault Merle [OCA, France]
* 16-May-2012: units of equivalent widths fixed (milli-Angstroems
instead of Angstroems)
(End) Thibault Merle [OCA, France] 2012-May-04