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2011MNRAS.418..863M - Mon. Not. R. Astron. Soc., 418, 863-887 (2011/December-1)

A grid of non-local thermodynamic equilibrium corrections for magnesium and calcium in late-type giant and supergiant stars: application to Gaia.


Abstract (from CDS):

We investigate non-local thermodynamic equilibrium (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∈ [3500, 5250] K, log g∈ [0.5, 2.0] dex and [Fe/H] ∈ [- 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 [Radial Velocity Spectrometer (RVS)] wavelength domain [8470, 8740] Å. The NLTE corrections are provided as a function of stellar parameters in an electronic table as well as in a polynomial form for the Gaia/RVS lines.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): line: formation - radiative transfer - stars: abundances - stars: atmospheres - stars: late-type

VizieR on-line data: <Available at CDS (J/MNRAS/418/863): mgi4167.dat mgi4571.dat mgi4702.dat mgi4730.dat mgi5167.dat mgi5172.dat mgi5183.dat mgi5528.dat mgi5711.dat mgi7657.dat mgi8473.dat mgi8715.dat mgi8736.dat mgi8806.dat mgi8923.dat mgi8997.dat mgi10312.dat mgi11828.dat cai4226.dat cai4425.dat cai4578.dat cai5512.dat cai5867.dat cai6102.dat cai6122.dat cai6161.dat cai6162.dat cai6166.dat cai6169a.dat cai6169b.dat cai6455.dat cai6572.dat cai7326.dat cai8525.dat cai8583.dat cai8633.dat caii3933.dat caii3968.dat caii8248.dat caii8498.dat caii8542.dat caii8662.dat caii8912.dat caii9854.dat caii119a.dat gaia_lin.f90> representing the non-LTE corrections for MgI and CaI lines in the stellar parameter range Teff=[3500,5250]K, log(g)=[0.5, 2.0], [Fe/H]=[-4.0,0.5] and [alpha/Fe]=[0.0,0.4].

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