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J/A+A/305/245                      Fe I in metal-poor stars (Magain+, 1996)
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Empirical study of departures from the excitation equilibrium of Fe I in
metal-poor stars
      Magain P., Zhao G.
     <Astron. Astrophys. 305, 245 (1996)>
     =1996A&A...305..245M      (SIMBAD/NED BibCode)
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ADC_Keywords: Abundances ; Equivalent widths
Keywords: stars: abundances; population II - Galaxy: abundances

Description:
    A detailed analysis of neutral iron lines in a sample of 13 metal-poor
    dwarfs and subgiants is carried out on the basis of high resolution
    spectra obtained with the ESO Coude Echelle Spectrometer. The deduced
    iron abundance is found to depend on the excitation potential of the
    line used, higher excitation lines generally indicating higher
    abundances. This could be caused by departures from the local
    thermodynamic equilibrium (LTE) or by temperature inhomogeneities in
    the stellar atmospheres. The dependency of this effect on the stellar
    atmospheric parameters is investigated. From the comparison of iron
    lines with lines of other elements, it is concluded that the low
    excitation Fe I lines are much more affected than the high excitation
    lines. The consequences of these effects for the classical abundance
    analyses are examined. It is found that they may explain, at least in
    part, some previously reported discrepancies between the results of
    different authors.

Objects:
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       RA  (2000)  DE      Name
    --------------------------------
    00 38 31.8 -08 18 07   HD   3567 
    04 01 42.6 -57 12 45   HD  25704 
    14 01 03.9 -38 02 59   HD 122196 
    14 30 12.7 -62 51 41   HD 126793 
    14 59 51.6 -22 00 20   HD 132475 
    17 00 46.7 -64 33 01   HD 152924 
    17 42 49.5 -40 18 55   HD 160617 
    18 16 27.3 -59 24 04   HD 166913 
    20 01 01.2 -12 15 02   HD 189558 
    20 23 33.8 -21 21 22   HD 193901 
    20 26 11.4 +09 27 28   HD 194598
    20 40 49.1 -18 47 13   HD 196892 
    20 58 07.7 -48 12 01   HD 199289 
    --------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table4            178       36   Equivalent widths and abundances
table4.tex        114      103   LaTeX version of table4
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Byte-by-byte Description of file: table4
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   Bytes Format  Units   Label    Explanations
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   1-  3  A3     ---     Element  Element
   6- 12  F7.2   0.1nm   Lambda   Line wavelength
  16- 19  F4.1   0.1pm   EW3567   []? Equivalent width for the star HD 3567
  21- 25  F5.3   ---     Ab3567   []? Abundance for the star HD 3567 (1)
  27- 30  F4.1   0.1pm   EW25704  []? Equivalent width for the star HD 25704
  32- 36  F5.3   ---     Ab25704  []? Abundance for the star HD 25704 (1)
  40- 43  F4.1   0.1pm   EW122196 []? Equivalent width for the star HD 122196
  45- 49  F5.3   ---     Ab122196 []? Abundance for the star HD 122196 (1)
  53- 56  F4.1   0.1pm   EW126793 []? Equivalent width for the star HD 126793
  58- 62  F5.3   ---     Ab126793 []? Abundance for the star HD 126793 (1)
  67- 70  F4.1   0.1pm   EW132475 []? Equivalent width for the star HD 132475
  72- 76  F5.3   ---     Ab132475 []? Abundance for the star HD 132475 (1)
  78- 81  F4.1   0.1pm   EW152924 []? Equivalent width for the star HD 152924
  83- 87  F5.3   ---     Ab152924 []? Abundance for the star HD 152924 (1)
  92- 95  F4.1   0.1pm   EW160617 []? Equivalent width for the star HD 160617
  97-101  F5.3   ---     Ab160617 []? Abundance for the star HD 160617 (1)
 106-109  F4.1   0.1pm   EW166913 []? Equivalent width for the star HD 166913
 111-115  F5.3   ---     Ab166913 []? Abundance for the star HD 166913 (1)
 117-120  F4.1   0.1pm   EW189558 []? Equivalent width for the star HD 189558
 122-126  F5.3   ---     Ab189558 []? Abundance for the star HD 189558 (1)
 130-133  F4.1   0.1pm   EW193901 []? Equivalent width for the star HD 193901
 135-139  F5.3   ---     Ab193901 []? Abundance for the star HD 193901 (1)
 143-146  F4.1   0.1pm   EW194598 []? Equivalent width for the star HD 194598
 148-152  F5.3   ---     Ab194598 []? Abundance for the star HD 194598 (1)
 157-160  F4.1   0.1pm   EW196892 []? Equivalent width for the star HD 196892
 162-166  F5.3   ---     Ab196892 []? Abundance for the star HD 196892 (1)
 168-171  F4.1   0.1pm   EW199289 []? Equivalent width for the star HD 199289
 173-177  F5.3   ---     Ab199289 []? Abundance for the star HD 199289 (1)
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Note (1): Abundance = log[Element/H]+12
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(End)                                             Simona Mei [CDS]   07-Jun-1995